i bought the class sets, but can't figure out for the life of me how i'm supposed to change them. also is there a way to switch between class sets in a match?
To edit and change the sets you need to use LB and RB whilst not in a game to flick between then. The last set you edited (or last accessed) will be the set you end up with in the next game. To my knowledge you are unable to switch between sets whilst in game.
Yup, cannot change between sets in-game. Quite disappointed in that. Especially when you are get plugged into a game-in-progress where you don't even know what the map is beforehand. (And, yes, I realize you could have a generic set to start in with, but that defeats having all the slots.)