It's been nearly a week in Fedora 34 
Things I've enjoyed:
1) Installation was a pain free process.
2) The software center will find firmware updates I didn't know I needed and help me install them.
3) I may open and close my laptop lid or hit the suspend button many times and my system stays stable.
4) Flatpaks work so well here that I really enjoy them.
5) The community is helpful and engaging.
6) Discrete GPUs just work in Gnome after a single package install
(1/2)
Things that were challenging for me:
1. There isn't always an RPM/Flatpak for something I want to run. Arch linux and Debian have spoiled me. It took some massaging but I got everything I wanted.
2. Divergence from standards that I'm used to caused me some trouble but also taught me some new things. Like systemd-resolved and split DNS. With innovation comes learning.
3. My battery calibration is no longer accurate, but it's coming along.
On the whole I am very, very impressed.
