This, in my opinion, is a fantastic item. I bought this for use with my MacBook Pro running Mainstage 2. It works seemlessly with Mainstage, offering exactly the amount of control that I was looking for. I now have a fantastically versatile guitar rig for live performance.
Excellent build quality finishes this off brilliantly. 10/10 thus far.
It was also very simple to 'aggregate' this unit with Apogee Duet2, giving extra output possibilities. Worth every penny!