Been using nixos for a couple months now. It's nice and I really enjoy having all my configuration in one place and able to be version controlled. The down side being installing and configuring things take a bit more time to read how nix does it. I have it on a laptop that I've been playing with and removed it and put rocky for something else but I am 100% confident I can go right back to the way i had it.

So far the cons I'm seeing is installing vscode plugins are a little annoying and setting up to do python development on existing projects not very easy.