This gun rips. I've used it one tourny so far and it easily kept up with angels. You don't realy need to get any thing becuase it comes mostly upgraded. it's super fast and and light ( at least for me), it's lighter than my friends base impulse. It looks sweet, i had so many people compliment my impy. Over the chrono, it shot very consistant(thanks to the max-flo). Mine shot 270,270,265. it is very accurate with the right paint/barrel match.
I choped once, but that is becuase i forgot to turn my revy on. I havent experienced fsdo.
This is probably the best gun for the money. it is tourny ready out of the box and shoots accuratly too. Come with the max-flo, which is probably the one of best regs out there. it shoots just as fast as the 1000+ markers.