@jrreid I use a Fantom 07 as a controller and a sound source at every gig I do. It works very well in that scenario as is also very stable as an audio interface with good latency. I only recently switched from using it for audio to using a MOTU M4 as an audio interface so that I could also have a controllable Mic input.
You can see more details of my rig here: Dave Boulden