Cross post - mine arrived last night. I only had an hour or so, I set it up with one of the two sensors and quickly ran through setup. Didn't configure the play space properly, so I couldn't really walk around that much, but... WOW!
I've watched a lot of VR videos on YouTube, and watched some streamers who play a lot of VR on Twitch, but experiencing it yourself is something else (for me at least).
I went through the demos, even the first room - the one where it's all white and there's nothing really in it, it was so weird in VR! With a little bit of suspension of disbelieve, you feel like you're really there. The high-rise demo, the little alien guy, the robot in the trailer thing - awesome!
I downloaded Lucky's Tale and had a quick blast, it's so weird to be able to look around things. Like putting your head around/through something, and to be able to see it the other side. I knew this was possible of course, but to actually do it is really fun. The Touch Controllers are great, really intuitive.
Some negatives of course, as with everything. For the focus to be the best for me, I get reasonably sized black bars noticeable on the left and right of my view. I can liken it to looking through a scuba mask. The 'screen-door effect' is also quite noticeable when you look for it - however when I stopped looking for it and just enjoyed the content I barely noticed anymore. One thing which I wasn't especially prepared for to the extent it bothers me, is - this thing is HOT to wear! It felt like if you don't let the lenses warm up, they can fog up pretty easily. It's also quite hot to wear, not the device itself being hot but rather pressed against your face hot. My nose sits surprisingly high into the unit itself, so if you're a nose breather like I guess I am, it doesn't help with the air temperature in the Rift itself.
Like I said though I really blasted through the setup, only had one sensor, and just wanted to see VR in the hour or so I had last night. I'm sure if I configured everything properly, and calibrated my space then it would be even better. My first impressions are great so far.