Personal force field gives 67.5% defense to a controller, unslotted. That's 22.5% *more* defense than you need to hit the soft cap and floor everything's chance to hit. So, it definitely doesn't need slotting for defense - it would literally do nothing against 99% of the enemies in the game, and most of the remaining 1% simply ignore defense in one way or another anyway.
Personal force field also grants 40% resistance to everything except toxic. This is far below the cap, and thus would make sense to enhance - except PFF doesn't take resistance enhancements, and the resistance effect is tagged [Ignores Enhancements & Buffs] anyway. So, no dice here either.
On the other hand, it does take 15 seconds to recharge after you turn it off - sometimes you might need it to come back up sooner if a boss gets in a good hit or two just after you turn it off. Thus, sticking a recharge in the default slot certainly isn't wasted. If you really want, you can stick a second in - that cuts it down from about 11.25 seconds recharge to about 9s recharge. A 3rd is kinda wasted as it only drops you to ~7.75s.
Similarly, endurance reduction is not very important - it only costs 0.26 end/second, and given that you can't attack while you have it active, turning on PFF is likely to *lower* your endurance use, not raise it.
Finally, in PvP you will gain *very* little defense from personal force field no matter how you slot it. For a point of comparison, in a PvP zone my dominator has about 15% defense from scorpion shield, and turning on PFF raises that to a whopping 20%. Such is the harsh reality of diminishing returns. While turning on PFF in a PvP zone will likely help a little bit, it sure as heck doesn't matter what you have slotted in it (for an experiment, I stuck a defense SO in my dom's PFF and it added a total of like ~0.2% defense, or something absurdly small like that). So, for PvP it also doesn't really matter what you put into it.
The best use for slots in personal force field, in my opinion, is to hold special IOs. It takes defense sets, and thus you can put in special IOs like karma knockback protection, kismet +6% tohit, luck of the gambler 7.5% global recharge, gift of the ancients runspeed, etc. Since it doesn't really need any slotting *anyway*, it's not like you're gimping the power by slotting these IOs that don't improve the specific power they're slotted in.
If you have a metric ton of spare slots, you could also stick one or another defense set into the power, just for the set bonuses. However, given that you have at *least* three other powers which not only take defense sets, but can actually benefit from the enhancement bonuses themselves, I wouldn't bother.
Short and long of it: either toss a recharge in the base slot and call it done, or use it to slot special IOs like LOTG:rech, karma -KB, etc.
@MuonNeutrino
Student, Gamer, Altaholic, and future Astronomer.
This is what it means to be a tank!
Really interesting response. Thanks. I might just throw a special IO in it i suppose.
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Personal force field gives 67.5% defense to a controller, unslotted. That's 22.5% *more* defense than you need to hit the soft cap and floor everything's chance to hit. So, it definitely doesn't need slotting for defense - it would literally do nothing against 99% of the enemies in the game, and most of the remaining 1% simply ignore defense in one way or another anyway.
Personal force field also grants 40% resistance to everything except toxic. This is far below the cap, and thus would make sense to enhance - except PFF doesn't take resistance enhancements, and the resistance effect is tagged [Ignores Enhancements & Buffs] anyway. So, no dice here either.
On the other hand, it does take 15 seconds to recharge after you turn it off - sometimes you might need it to come back up sooner if a boss gets in a good hit or two just after you turn it off. Thus, sticking a recharge in the default slot certainly isn't wasted. If you really want, you can stick a second in - that cuts it down from about 11.25 seconds recharge to about 9s recharge. A 3rd is kinda wasted as it only drops you to ~7.75s.
Similarly, endurance reduction is not very important - it only costs 0.26 end/second, and given that you can't attack while you have it active, turning on PFF is likely to *lower* your endurance use, not raise it.
Finally, in PvP you will gain *very* little defense from personal force field no matter how you slot it. For a point of comparison, in a PvP zone my dominator has about 15% defense from scorpion shield, and turning on PFF raises that to a whopping 20%. Such is the harsh reality of diminishing returns. While turning on PFF in a PvP zone will likely help a little bit, it sure as heck doesn't matter what you have slotted in it (for an experiment, I stuck a defense SO in my dom's PFF and it added a total of like ~0.2% defense, or something absurdly small like that). So, for PvP it also doesn't really matter what you put into it.
The best use for slots in personal force field, in my opinion, is to hold special IOs. It takes defense sets, and thus you can put in special IOs like karma knockback protection, kismet +6% tohit, luck of the gambler 7.5% global recharge, gift of the ancients runspeed, etc. Since it doesn't really need any slotting *anyway*, it's not like you're gimping the power by slotting these IOs that don't improve the specific power they're slotted in.
If you have a metric ton of spare slots, you could also stick one or another defense set into the power, just for the set bonuses. However, given that you have at *least* three other powers which not only take defense sets, but can actually benefit from the enhancement bonuses themselves, I wouldn't bother.
Short and long of it: either toss a recharge in the base slot and call it done, or use it to slot special IOs like LOTG:rech, karma -KB, etc.
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Wow. A very thorough, informative and well said answer. Sir, I salute you! 
This is why I like to read the forums.
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Putting the Kismet unique in PFF may not be the best choice, Since it's one of the ones that buffs you for 2 minutes after using the power - in other words, you don't get the buff unless you're running PFF (and can't attack), or you have to turn PFF on every 2 minutes.
I'd but a Karma and/or LotG in it.
@Roderick
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Personal force field gives 67.5% defense to a controller, unslotted. That's 22.5% *more* defense than you need to hit the soft cap and floor everything's chance to hit. So, it definitely doesn't need slotting for defense - it would literally do nothing against 99% of the enemies in the game, and most of the remaining 1% simply ignore defense in one way or another anyway.
Personal force field also grants 40% resistance to everything except toxic. This is far below the cap, and thus would make sense to enhance - except PFF doesn't take resistance enhancements, and the resistance effect is tagged [Ignores Enhancements & Buffs] anyway. So, no dice here either.
On the other hand, it does take 15 seconds to recharge after you turn it off - sometimes you might need it to come back up sooner if a boss gets in a good hit or two just after you turn it off. Thus, sticking a recharge in the default slot certainly isn't wasted. If you really want, you can stick a second in - that cuts it down from about 11.25 seconds recharge to about 9s recharge. A 3rd is kinda wasted as it only drops you to ~7.75s.
Similarly, endurance reduction is not very important - it only costs 0.26 end/second, and given that you can't attack while you have it active, turning on PFF is likely to *lower* your endurance use, not raise it.
Finally, in PvP you will gain *very* little defense from personal force field no matter how you slot it. For a point of comparison, in a PvP zone my dominator has about 15% defense from scorpion shield, and turning on PFF raises that to a whopping 20%. Such is the harsh reality of diminishing returns. While turning on PFF in a PvP zone will likely help a little bit, it sure as heck doesn't matter what you have slotted in it (for an experiment, I stuck a defense SO in my dom's PFF and it added a total of like ~0.2% defense, or something absurdly small like that). So, for PvP it also doesn't really matter what you put into it.
The best use for slots in personal force field, in my opinion, is to hold special IOs. It takes defense sets, and thus you can put in special IOs like karma knockback protection, kismet +6% tohit, luck of the gambler 7.5% global recharge, gift of the ancients runspeed, etc. Since it doesn't really need any slotting *anyway*, it's not like you're gimping the power by slotting these IOs that don't improve the specific power they're slotted in.
If you have a metric ton of spare slots, you could also stick one or another defense set into the power, just for the set bonuses. However, given that you have at *least* three other powers which not only take defense sets, but can actually benefit from the enhancement bonuses themselves, I wouldn't bother.
Short and long of it: either toss a recharge in the base slot and call it done, or use it to slot special IOs like LOTG:rech, karma -KB, etc.
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Wow. A very thorough, informative and well said answer. Sir, I salute you! This is why I like to read the forums.
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and the same reason why, I love coming to the forums..
Freedom Bound!!!
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Putting the Kismet unique in PFF may not be the best choice, Since it's one of the ones that buffs you for 2 minutes after using the power - in other words, you don't get the buff unless you're running PFF (and can't attack), or you have to turn PFF on every 2 minutes.
I'd but a Karma and/or LotG in it.
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Whoops, yeah, forgot about that. Don't put the kismet 6% tohit in it, unless you like turning PFF on and off every 2 minutes to keep the buff. Stick that IO in something you'll be running all the time like combat jumping or dispersion bubble.
@MuonNeutrino
Student, Gamer, Altaholic, and future Astronomer.
This is what it means to be a tank!
Any suggestion as to slotting PFF? money no option. would like to feel somewhat safe if i need to venture into pvp zones, but would like it pimped for pve and bosses as well.
Something durable if i need to hit the panic button and use aid self.