I used a MPC for a little while (the 2500) and honestly I wasn’t impressed. I was quite disappointed by the pads and build quality. The pads seemed rigid and not sensible enough. To get the max velocity you had to hit REALLY hard. And when you did that there was some noise from the metal parts vibrating inside the MPC. 
(apparently it was not just my foulty MPC, I googled and there were lots of people with the same problem)
There are also some nice features to MPCs, like this one, for example. Small things, that make it a bit more suitable for live use and whatnot…
But making a complex songs with a MPC, cutting samples and so on? No, thanks.