I ordered this as a complementary keyboard/controller to my other keyboard, and it has worked well beyond my expectations. It natively hooks in to Bitwig and you can control various aspects of Bitwig with zero manual setup, which is great. If you want to you can obviously bind/re-bind things to your liking too.
I also like the single-key chords and the arpeggiator, especially when fiddling with sound settings on my computer screen and don't want to concentrate in particular on what I am playing.
My one complaint would be regarding the drumpads and their velocity settings, but I guess it could just as well be me, being used to the pads on my other "big" keyboard and the velocity curves on that.
All in all this was a great purchase, especially if you use Bitwig.