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Guy modded his steam deck be as small as possible, with the only intended use to be to play with an external controller and AR glasses.
Finished photo: 
How are these glasses? Any good?
I have a Viture One and an Xreal Air 2. They're both solid for gaming as a screen directly attached to your face. Neither do floating or body-anchored screens out of the box. The Xreal can do it with a breakout box, and the new generation of the Xreal that's coming out in March is supposed to do it on its own.
Viture One came with a better carrying case and is easier to hook up in the dark. It's slightly more comfortable to wear, and it has built-in focusing dials. Picture quality is good for gaming and watching videos, but not good enough for extended text reading - books and websites aren't recommended.
The Xreal Air 2 has a much better screen, good enough for reading for an hour or so. The edges get some chromatic aberration, but most of the screen is good. It requires prescription inserts if you need glasses - a mixed blessing since it adds a hidden $80 to the price, but means you can wear them as real glasses. The nose bridge has size options, but none are quite as comfortable as the Viture. The Xreal uses standard USB-C cables, which is good for compatibility, but bad for attaching in the dark. As mentioned above, Xreal has a breakout box that gives different options for how the screen is displayed - attached to your head, attached with a delay (better for motion sickness), PiP so you can look at the real world with your media in the corner of your vision, and attached to your body giving the illusion of a TV screen sitting a distance from you.
It depends on what you're looking to do with the screen, but I'd probably wait until the new generation of Xreals.
I have several pairs of these glasses from Viture. They’re very good. Not sure how the xreals are. But the technology is legit.
I've used a Hololens before, and it was pretty cool display-wise, but not even remotely worth the price in practice. What would you recommend to use in conjunction with a Steam Deck dock?
Yes absolutely. Very different than HoloLens. They still need to get the fov up a bit higher I think before they explode. But, I often use them for watching shows or playing in my steam deck in bed so I don’t interrupt my partner trying to sleep.
https://www.youtube.com/watch?v=8d-U9kpJmts
There’s some shots in this video of his camera looking through the lenses. Not a great representation but good enough I think to get the idea