if you just need a quick miniature key controller and don't need full portability, this product is really okay.
it's longer than the 37-key micro controllers but everything is just fine if you ever used USB MIDI stuff before.
just be ready to have puny keys and not the "piano" experience.

i'm not rating features, because i don't use the extra features from keyboards. I just use the keys and pitch and mod wheels.
The octave shift keys are used too and they work just fine.

5/5 stars if you really need to know.