The Keys have a plasticky, springy feel to it. It has a lot of features but overall you can buy a better one if you can get by without all the faders and pots. Nonetheless, for the price, it's very complete.
After a few months of use, both the Mod and Pitch bend wheels as well as the fader caps have become very sticky with an abundant amount of melted glue on them. Apparently, the initial rubbery feel of the caps and wheels is obtained by covering common plastic parts with some sort of gluey layer that will, eventually, melt. Wouldn't buy it again.