Dual Pistols
I'm pretty much the same with my 50 DP/Elec blaster. Every so often I've used a different ammo type, but for the most part stick to Inciny ammo. Defenders get better results from the other ammo types...but the damage is just to anemic for my taste.
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I find myself using no special ammo for the KB. I duo with a rad/nrg blaster and caltrops and the KB we both have makes life a whole lot easier when we get higher level spawns or tougher mobs. When things arnt going hard I use the incendery rounds for the damage. Cryo and toxic just dont seem to do much. I could see a defender/corrupter getting more mileage though.
The different ammo types are largely useless for a Blaster. You're going to use Incendiary all the time unless you need extra survivability more than damage, in which case you'll use Standard for the KB. Chem and Cryo's effects are too weak to bother with.
On a Defender you'll probably actually use all four types though. Defenders get much stronger secondary effects so the slow or -damage actually becomes a viable option, especially since a Defender's job isn't so much to dish out raw damage as it is to buff and debuff things. That's why I consider Dual Pistols a better Defender / Corruptor set than a Blaster set (it's not a horrible Blaster set, but the whole multiple ammo type gimmick is going to be pretty much ignored).
Cascade, level 50 Blaster (NRG/NRG since before it was cool)
Mechmeister, level 50 Bots / Traps MM
FAR too many non-50 alts to name
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I've been playing a new Praetorian Storm/DP Defender (made Level 11 during double XP weekend!) and I've actually been using Cryo Ammo ever since reaching Level 10 simply for the Slow stacking with Snow Storm (which debuffs speed and recharge). Also, at low levels the difference between Incendiary and other damage types is really minimal (because the numbers are all small).
I figure that the "need" for Cryo Ammo will change once I start getting more powers into the mix as I level up, but for now, Cryo has been "good to me" as a survival tool when fighting Resistance, PPD and Ghouls at low levels. So I for one am glad the option is there.
I am loving my Dual Pistols Blaster but I think the "Swap Ammo" feature is not balanced. I use Incendiary Ammo almost all the time and think the other ammo types could be more than a novelty.
Just my thoughts