The koxx headsets are THN Industries. Cheap.
I've used one since I got my coust, last summer. No problems yet, just that it doesn't spin very smoothly. I don't barspin much though, so it's OK.
Also, it was the lowest stack headset I could find, so I bought it so I could use my Echo forks which I had cut the steerer down loads to fit my previous ride, which had internal headset and shorter headtube.
All in all a decent headset.
I definitely would have gotten get something more expensive and sealed if it wasn't for my headtube length, but hey.