It has a speaker not a fan.

It has audio out and Midi over USB.

It has Blutooth Midi…use it as a controller. And it has Bluetooth audio…use it as a speaker…for example you can play a synth on you iPhone and monitor the output with an FM-1.

The battery lasts a reasonable time and it can be powered by USB…you don’t need a special wall-wart (or you can stay unplugged with an ordinary power bank).

In terms of build, I’d say its about as roadworthy as a Volca. At worst it’s no more fiddly. And the display is much much less cryptic.