So I found myself in a Samsung store in Melbourne today, where they had a Gear VR on demo next to their Galaxy S7's (get a free Gear VR with S7 purchase before June 30 btw)
The screen was a little blurry (not focussed right) and I think someone else may have left a little hair product in one spot of the screen.
My thoughts:
The screen was VERY dotty. Much more than I expected. I sure hope the Rift is MUCH better.
The demo consisted of various short scenes that suddenly switched. Despite standing I had no problem looking around as 'I' skied down a massive mountain, or surfed on a large wave. I even didn't have anywhere near the amounts of problems standing still for the rollercoaster scene compared to other clips, although it was the only scene where my heart sank a little and I had to brace my footing in advance - similar to if you stand in a moving train).
The movie theatre scene was pretty good, as was the one where I appeared to have a private concert with Bono.
While not perfectly adjusted, the front still seemed a little too heavy. I didn't find myself looking around that much in the moving scenes - basically just looking where 'I' was going, so the 360 aspect was a little lost on me, although practically flawless - no stitching issues.
I wouldn't recommend buying one though. Maybe wait for version 2. I had no problem adapting - it feels a little like poking your head through a hole in the wall where the scenery is completely different. Standing in the noisy store certainly didn't give me any chance to feel fully immersed however.
I'll be back with more feedback with the Rift whenever it arrives, expecting a better experience with the improved hardware and interactive content. I'm pretty sure VR is here to stay, much like 3D TVs.