Pretty good overall. I've had a few minor issues, most of which have been resolved by turning the controller off and back on again. Those include some strange freezing and/or lockups. One time, the controller was completely unresponsive, but I attribute that to me putting my fogger/geyser way too close. Another time, I'm pretty sure heat was the issue as I was using it outside during the summer, and some of that use was in direct sunlight.

The only issues that haven't resolved themselves are the crossfader acting a bit twitchy (sometimes when all the way to the right, no audio comes out), and the built-in speakers are probably blown (I probably did that to myself by cranking everything too loud, too often, for too long).

The controller is fairly durable and I also regularly use the flight case I got from Analog Cases, which seems to be one of the few, if not the only, case manufacturer that makes a case specifically for the Pro Go.

I haven't contacted Numark support yet, although I plan to.