I wasn't very impressed with the large pads... they are very sensitive to being hit in anything but the 'sweet spot' and can give very unreliable (read different velocities) results, IMO.
Sonically, I haven't heard the new Expanded M3 except online, but the original reminded me FAR too much of my Triton...
That new 4-way piano is a keeper, though! Karma2 is cool, but lacks much for the more mature player... I don't do much hiphop and trance!
100 or so more R&B (old school!), Rock and jazz Karma setups would help...
Tough to fault the price, though, at nearly a grand less than a MotifXS6...