It is a hair on the squishy side, but actually not too bad. I was pleasantly surprised. It's nowhere in the class of my Voyager, but much better than say the Oxygen, Novation and Akai keyboards I've tried.
Unfortunately I'm not a fan of the mod/pitch wheels. The throw is far too short. The wheels need to be much larger, but again .. some of those other keyboards it's still better than most of the cheapy keyboards.
Aftertouch is not very sensitive. You can play it a little but it is very difficult to keep the value under 100. But I can control that little bit of top end to some degree. Maybe with a little practice ... Again, it isn't horrible, but it isn't great either.