The controller is great, the 3 octaves are useful, and all the buttons and encoders are solid.
There is only a small problem with the action of the keys that is not so easy to explain (and I'm not sure if it's just my unit?):
After you press a key, if you don't let it rise back up completely you can't play it again, it just doesn't trigger. The only way to retrigger a key is to let it rise up completely to its resting position and then press it again. This makes creating fast/soft repetitions on the same key somewhat tedious.