From my experience as someone who uses Ultramarine Linux currently: The download page is fine, but not great as a new user. That alone kind of pushed me away, since I wasn’t sure if I was downloading the right ISO. I can definitely tell the packages are outdated. I like GNOME desktop (which is what I downloaded), but I definitely know that other distros make customizations to GNOME that I had begun to take for granted (e.g. pre-installed taskbar via GNOME extensions). I could definitely use Debian but I find it just… a bit behind? Like it definitely works, but other distros are slightly more user friendly. Debian can be customized to match those other distros, especially with Flatpak, but any distro that isn’t user friendly out of the box I don’t want to recommend.
The thing I’ll be interested to see is more what type of software support this will have in reality. Benchmarks might be good, but if it has the same issues Wine has (you have to look up which versions are compatible and change these settings and download these .net runtimes or whatever to get one app to work) then it really just isn’t worth it. I have a Windows virtual machine and I can run any EXE I need to on it, which isn’t many, usually just for testing Windows applications I need to test out. The thing that is most annoying for me isn’t necessarily performance, just the fact I need to change Wine settings for every app I install. I really hope this takes off, but I also hope it is better than Wine not just in performance, but also in simplicity.