A lot of scenes were grainy and unclear, and I fiddled around with the focus a lot, because I just couldn't believe I was really at max quality. It was annoying, especially when I compensated by focusing my eyes so hard, which made the experience jarring, even bordering into headache territory. It was like that feeling you get after staring at a computer or mobile screen for too long, multiplied because it's right in front of your retinas.
There are some "operational" problems
A few more kinks need to be ironed out -- in my swiveling, I nearly spilled my beer bottle. Without being able to see my hands, I couldn't have even imagined the mayhem that would've occurred with a popcorn bag (but I'm also a total klutz).
A room packed with swiveling, snacking, laughing, shrieking fellow theatre-goers could turn into a circus in a hurry. You could be all relaxed, riding a trippy Dali elephant, while the kid in front of you is guffawing away at a cartoon or a group of teens is screaming at some horror short. VR cinemas expect the utmost respect from moviegoers. Good luck with that.