I've been eye balling a pair of those for a while now.

Any other quirks you're willing to share? Such as: how's the input latency (from key press to seeing it)? early signs of tear? do I need to invest in spare parts?

No latency. No tearing that I've noticed. They can be configured to run at 60 Hz or 120 Hz.

I couldn't find any spare parts and honestly, I think that's because the brand is trying to liquidate the RayNeo Air 2 models in favor of RayNeo Air 2s and newer. It's admittedly the lower in quality than other offerings, but passable, and not bad for just $200.

It's only possible for me to work with these when font size is increased and the scaling is turned up. Trading information density for back/neck relief is worth it in my opinion.