>>268538308
Tracking is usable, but it's a noticable step down from anything else.
FoV is really low, I had trouble seeing the HUD in some games when I was using my Explorer.
Small sweet spot, lots of blur around the edges.
Resolution is good, but color and contrast is bad.
No hardware IPD adjustment, and software adjustment didn't help much in my opinion. Luckily my IPD was close enough to not need it.
No integrated audio at all, so you need headphones/IEMs and a mic.
Occasional compatibility issues, but it's not as bad as it used to be.

The really cheap ones are still decent budget headsets if you can't afford or justify getting anything more expensive though.