I still haven't had the opportunity to try it. That said, I am very susceptible to motion sickness, and need what I see to match my balance or I start getting woozy fast. (It means I don't get to surf the web much on trolleys or busses, though I'm okay on BART)
I also can't ride those jostle rides. Star Tours at Disneland circa mid 1990s actually had it synced pretty well, but before and since, all these rights are a fast-track to vomittown.
So I'd need a game to be super Johnny-on-the-spot with framerate and matching the screen to the orientation of the headset. At $300+ it's been too expensive an experiment to consider the possibility it may sit on my shelf as a puke engine.