Same. Rollbacks are awesome. Not only rollback in the boot menu, but also just keeping your OS configs in Git. It is so nice that I can mess with my configs wit

Same. Rollbacks are awesome. Not only rollback in the boot menu, but also just keeping your OS configs in Git. It is so nice that I can mess with my configs without concern, then when I am done I can diff them too see what I changed, continue messing to clean them up a bit, then commit (or reset if the experiment didn't work out). When I used Arch I would edit a handful of configs trying to set up something new or tweak a setting and I could not get back. I would need to take notes or just try my best (I have force-reinstalled packages countless times). I'm also waiting for the parts of my new desktop to come in and I'm excited that all it takes is cloning my config repo and applying to get to exactly the same setup. With Arch I would have reinstalled to clear the cruft that has accumulated, however with NixOS I can just audit my configs to see an entire list of cruft and easily undo it by removing lines.