Connection issues, would not work reliably in my home studio through USB hub, tried half a dozen cables. My two proper MIDI controllers have no such problem. Direct connection and on laptops it is fine.
Quite flimsy keys, hard to get consistent levels on the standard velocity curve.
Very small and portable.
Recommended if you want a really small controller with more than 25 keys for simple melodies and don't need a whole bunch of extra features.