I kept mine this whole time and I still actually use it regularly and it still amazes me. There's a steady trickle of interesting things that appear for it, and it's VERY useful as a giant virtual extended laptop screen if you have a Macbook. Especially if you are in a recliner and can tilt the virtual screen above your head a bit- vastly more comfortable. Very much looking forward to the extra large virtual curved monitor they're working on, hopefully this fall.
The thing is still kind of magical.
When I first got it, I would get some eye fatigue and/or dizziness after about an hour of using it, but that seemed to improve after a couple weeks (adaptation?) and I can now use it for 2-3 hours at a time uninterrupted without any discomfort. Chewing ginger apparently helps (same as with VR headsets).
Drinking coffee from a mug with it on is difficult. Get a straw.
I'm a big guy (6'3", 260lbs) and the headset is still a bit heavy.
The gestural and eye-focus UI is extremely good, my only complaint is that I still find it hard sometimes not to make erroneous inputs which can get frustrating, but that is more the fault of web UI's with closely-clustered controls that were not designed with this interface in mind- but sometimes with text input as well, it's sometimes frustrating.
The quality of the passthrough video (AR) can be improved, it's a bit shimmery (although still clear enough to comfortably read things on your phone or watch). It's stitched together from a bunch of cameras so it is surely already a technical feat.
The FOV is OK, but more is always better.
The immersive environments (and being able to dial them in and out) are FANTASTIC. Shout-out to the Bora Bora one in vOS 2.0 https://www.youtube.com/watch?v=bKueDGv4OVQ and the Marvel and Star Wars ones provided by the Disney app https://www.youtube.com/watch?v=lisof6XWtII&t=491s I also love the moon one. Each one has both a "daytime" and "nighttime" view as well.
It's fantastic on a plane, if dorky.