My initial experience with the Pi 400 wasn't good at all. Constant crashes and a corrupted 256GB SD card had me very upset. I was unable to get any Ubuntu distro working on the Pi, which was frustrating as I need a proper OS for daily tasks. Raspberry Pi OS just doesn't cut it for me. After over a week of trying other options, I found my new favorite Linux distro: Pop!OS. It's the least irritating OS I've ever used and the new release for the Pi works great. 

I had some trouble installing software on a fresh install, but cleaning up apt got it sorted. The PopOS website had perfect instructions. I'm becoming a fan of System76 and may order one of their machines soon. I spent all day working on getting a daily driver OS working and am happy so far. The first thing I did was install TimeShift for system backups and put an SD card in the unused slot to create an initial backup. After that I started installing all the programs I need. I ran out of disk space immediately and discovered most of thee bolt drive was unused. I made another backup and reinstalled using the Raspberry Pi Imager on my other laptop, instead of Balena Etcher. Same thing. I ended up opening the Gnome Disks utility, resizing the "writeable" partition, leaving about 1.2GB empty, and tried to boot the Pi. It worked the first time and I'm back up and running. 

I've currently got more software installing while I type this up on my phone in bed, and will do another system backup in the morning. 

I'll still be working with Raspberry Pi OS for development on my other project, but I'm no longer trying to use it as a daily OS. I'm very happy so far and will post updates, commands used, problems and solutions, and any custom code I make. I want to see the Pi 400 grow, spread, and succeed, and will keep working to test it as a daily driver. 

Hope someone enjoys this project and finds it helpful.