I've been trying it out for about a week on an extra SSD, and it works pretty well. Nvidia driver install and everything went very smoothly and much less of a hassle than on normal Fedora. However, I have had some frustrations with GNOME/Wayland and OBS, but that's probably because Wayland is known not to play very nicely with Nvidia cards. The polish is also not nearly on the level of Solus. It's basically just stock Fedora with gaming tweaks under the hood, and that's fine if that's what you want, but I've gotten so used to Budgie/Solus polish that I found myself really missing Budgie and the curated Solus experience.
In terms of performance it seems about the same, but I haven't done any direct comparisons. The most demanding game I have is Control, which seems to perform about the same on Solus v Nobara. I do however give the edge to Nobara in terms of steam integration and controller support. Right now on Solus I have to disable the redirect and intercept libraries to get my controller to work properly, and some other bugs affecting Steam/Origin games (and others) on Solus were not present on Nobara. There is a fix for this in the pipeline for Solus, but I didn't even have to think about it on Nobara.
There is a KDE version of Nobara, which I would grudgingly recommend (I was a GNOME guy for years until Budgie) if you have an Nvidia card and/or want to avoid the hassle of Wayland. You can run GNOME with X11, but I'm still noticing stutters in the UI. Might just be my card or my system. I'm going to try a few other DEs, and hopefully Josh and the Buddies of Budgie get Budgie into the Fedora repos soon.
Another thing to keep in mind is that Nobara has a stated goal of supporting newer hardware, so if you have an older system it might not work as well (Wayland compatibility is only available on Nvidia cards that use the 510 driver or newer).
Tl;Dr: Performance seems (subjectively) about the same. Solus feels more polished and stable. Overall, a cool project that delivers on the promise, but still very young.
