its up to you, you would be losing some of the flexibility DP has. W/O it your limited to lethal damage only, having a portion of your damage as either cold fire or toxic does mitigate the lethal resists
the fire rounds do offer slightly more damage
with swap rounds you have something many a energy blast type would want, that is able to switch off the knock back
And the secondary effects may not a WoW factor in terms of strength or duration by themselves, they do stack well with the debuffs in your secondary set. Personally I generally use the fire or toxic rounds, occasionally using the lethal rounds.
My advice, we now have dual builds, have one build with it, one w/o and let yourself be the judge.
As with above, but I'd actually recommend taking that build to test once it opens back up and try it. I think the set is really built around the desirability of swap ammo.
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You dont nessesarily need it at lvl 6 either.... I put it off till 20 personally. I wouldnt make a DP build without it thou, its much too useful and being able to stack slow or -damage on a target with primary and secondary make it all too useful.
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I'd second Wassabi, you don't need it immediately, but you don't really want to skip it entirely. Dual Pistols was designed with the Swap Ammo power as an integral part of the set so if you skip it then you're losing the variable functionality of every other power in the set.
Is swap ammo avoidable? or should every DP toon get it?