I've been using COSMIC for a while now without problems, and the store is great. Easy to theme and the apps are pretty good. I haven't checked it lately, but I hope the greeter improves soon.
I'd recommend everyone to try out cosmic-store (with cosmic-icons) when they get a chance. Whether you use COSMIC or not, it's fully functional with any desktop environment. It's packaged by default in Pop!_OS 22.04, available in Fedora 40 via ryanabx/cosmic-epoch, and the AUR.
Gave it a shot. Definitely a performance increase over Pop!_Shop (and it doesn't drive my Thelio's CPU cooler nearly as hard). I do miss the colorful greeter on the shop with the Pop!_OS branding though. Are there plans to integrate something similar into the COSMIC store, or is its UI largely complete at this point?
Pop!_OS is going to stand out with this new desktop environment. System76 is clearly giving it enough attention to make it as good or better than other Linux desktop environments.