Primarily using it for software development. I'm a web dev. I'm on day three of all-day usage (~8hrs, with breaks) and my experience has improved with each day, both in terms of comfort and as I get used to visionOS. I have 10 windows open in front of me right now, including my calendars, Slack, Messages, Spotify (in Safari), ChatGPT, a reference browser for documentation, and a few other odds and ends. My main front and center window is my 4k MacBook Pro 16" screen in 1080p (larger than that and the screen is too large for me or the text too small, but I prefer slightly larger text usually).

I've also used it for reading, watching movies, and reminiscing over old photos. Something I don't think that has really been captured well in reviews is how incredible it is to look at life-size recreations of photos you took on your phone, even plain old 2D ones. There's something really special about seeing a photo at life-size scale wherever you want, even if you technically can achieve this with a massive projector. And that's to say nothing of the bittersweet nostalgic nature of spatial video / photos, which has, if anything, been profoundly understated.

It is not my first headset. Previous to the AVP, I owned Quests 1, 2, and 3, and I experienced the Rift before that. I tried, hard, to work all day in each of the Quests as that was my primary use case for them, but flamed out after a couple of hours every time.