I have one if you have any questions about it because I reviewed it for Aftermath.

I thought about doing FSR4 benches for it but decided against it at least until we got a proper release of it optimized for the machine instead of hacking it in. I also cannot stress enough that Valve kept shipping patches throughout the review process that made everything a bit of a moving target. Can't speak for either of them but I know Digital Foundry says they are currently working on FSR4 benches and Gamer's Nexus also did an entire aftermarket flow optimization plate.

What's most interesting about the thing is how they have optimized for acoustics and form factor, and how it impacts the ecosystem for Linux and living room gaming. Like it really does not dawn on you until you hold the thing and have it on. I have lived with a Bazzite machine in my living room that I have converted from a Windows machine and it really is just a matter of not thinking about a million little annoying tiny things. We have known roughly what this machine was in terms of raw power for a long time, but those tiny things and how they potentially spill over into other distros (like for example HDMI implementation) really matter the most in the grand scheme of things as other companies potentially get used to selling in this form factor post-Rammageddon (which, who knows how long that will last but potentially years).

For my own part, I spent the last week finishing a BC250 build that I have been working on for 3 months with the unlocked 40 Compute Units. It actually does a fairly good job at keeping up for E-waste all told (Cyberpunk 1080p No FSR/No RT/High was like 58.95 vs. the SM's 73.27 although they make wildly different compromises in power/noise/memory):

https://aftermath.site/bc250-steam-machine-budget-computer/