I've been using this controller for about 9 months now and I don't know how I've been doing all this time without it.
To me it's the perfect controller to be able to quickly switch between my computer and my guitar modeler (as sources) and between my studio monitors and my headset (output), by the push of a button.
Only small minus point: when adjusting the volume, the sound crackles a little at times while turning the knob. But when the knob is still, all is fine.