I bought this as a lower manual for a Hammond organ clone. Lightweight, easy to select MIDI channel, keybed/action is perfectly fine, and the USB power works just fine out of the USB port on a portable power strip (doesn't need much power at all).It's also not very tall, and since the controls don't need to be accessed much, if at all, it's perfect for my needs, IOW, just being buried by a Hammond-Suzuki main keyboard on top of it.I can't say how long it will last, but so far, it's what I needed.