If you make heavy use of Komplete, it's almost a no-brainer (browsing patches, light guides, etc).
Keybed is better than most...
Takes a while to get comfortable with the pitch/mod ribbon controllers (if you haven't used them).
Build quality is pretty decent. Much better than many lower-cost MIDI controllers.
I've got the 61-key version.
Would like to get the 88-key version at some point.