i actually used fruity loops for 4 or 5 years prior to buying the mp. while i love it - i'll still occasionally make beats on there if they are multi-layered with lots of long samples - i prefer the tangibility and portability of the mpc. also, the compressor and eq on the MP sound mean, particularly on drums breaks i've chopped.
you use the MP in conjunction with anything else?
ah yeah i've messed with fruity loops quite a bit over the years, but never really took the time to make anything polished.
i've been looking into using the mpc as a controller for ableton, but i'm still learning what i can and can't do with the thing so i'm gonna stick with it alone for a good while. picked up a midi keyboard, but that's about it.