RPS did a review of this headset:
https://www.rockpapershotgun.com/2016/09/27/4k-vr-headset/
Selected snippets from the review:
"Yes, in all honesty the picture is sharper and clearer than either of the major headsets. It’s comparable to looking at 1080p where Vivulus is like watching 720p. Not relevalatory in practice, but enough to shift it from “if I squint I can just..” to “oh hey, I can see basically clearly.” This is a big win in theory. There is no screen door effect to speak of, and text is more legible – if, big if, you can coax its pupil distance adjustment feature in the software into working correctly."
"A more severe issue is that, while stuff looks fairly sharp if you’re looking at it dead-on, turning your head even a little or flicking your eyes fast is hoo-boy territory. Edges and text swim for a micro-second, long enough that you’re aware of your eyes adjusting, and given this is something you’re going to do hundreds of times during one session, it’s a huge downside."
"Even Elite Dangerous, a game I’ve been able to kick about in for a good few hours without feeling lousy in a Rift or Vive, knocks my sealegs from under me after 20 minutes or so."
"Add to this that the headset is dramatically more uncomfortable than the big boys, particularly on the bridge of the nose due to a hard, almost sharp plastic element unwisely placed there, and unfortunately you’ve got yourself a recipe for feeling absolutely dreadful. "
"Right now, having three different headsets sat on top of my poor, confused PC, it’s the Rift I’m feeling best about, or at least ‘least distrustful of’. It’s comfortable, it’s slick, it hasn’t got too many cables and its cost isn’t totally heart-wrenching. But if I had a strong constitution, not much cash and wanted to embed myself as deeply impossible in one or two specific games, such as Elite Dangerous or American Truck Simulator? Sure, there’s a definite case to be made for the Pimax, especially as software updates might iron out some problems. And yes, alright, dammit, I’ll say it: if your major motivator is saucy VR movies, this thing is probably going to do all the awful things you need it to at a fraction of the cost.
If I were a potential customer rather than some awful who got sent these things for review and thus would be far more motivated to keep using them regardless, I’d have to glue some foam under the monstrously uncomfortable nosepiece and stock up on Paracetamol, but yeah, it could work. Crucially, the price is such that I’m not going to scream at the sky for too many hours if I realise it’s mostly gathered dust a year from now.
There are a great many very sizeable drawbacks to the Pimax, particularly in terms of comfort (i.e. expect to feel rotten often), but it does get you the base fundamentals of the PC VR experience for sub-£250/$350, which is at least worth considering if you just can’t wait for a next-gen or a major price-drop from the current one. Waiting would absolutely be my recommendation, however. If someone’s made this for $300, surely someone’s going to make something even better for similar before too long."
So to summarize: No positional tracking, great resolution but problems when rotating your head. Not really comfortable to use, but cheap.
Read the entire review for more information.