Arturia Keystep 37

Good device and excellent build quality. The fact that it has an on/off switch is a nice touch.
However I dislike almost everything about it... The most annoying feature is the way all the buttons are blinking hard in your face when activated -- even the octave+/- buttons. In a dimly-lit studio this is infuriating and that's what had me eventually get rid of it.
Also, everything feels difficult. The rotary buttons are hard to move; setting up the device is not obvious; nothing quite works the way you'd expect and reading the manual is necessary.
It's not trying to be invisible, as a controller should IMHO; instead it's trying very hard to get noticed. It gets in your way.