I've been using Pop for a few years. I purchased a System76 laptop and decided to give it a spin since it was already installed. There's a lot of I like about, and overall appreciate System76's effort. It's very stable, works flawlessly with Lutris, and the Pop store is a refreshing take on package management. Ive continued using it since at this point I'm just settled in on my OS and don't want to bother setting anything else up lol.
That said, I'm still a much bigger fan of KDE over gnome and gnome derivatives. Pop lacks a lot of UI customization I'd really like to have. There's also only two themes,( and im not particularly interested in learning how to replace is manually).
I am looking forward to trying out their next iteration of the Cosmic DE though. The previews look awesome and it would be a big step forward for Pop.