I installed the most recent Bullseye image [1] on my Pi4B (4GB) a few days ago. It's happily running on the table next to me right now.
Here's what I found:
It loads and boots just as expected. Apt and tasksel work and I was able to install all the utilities I need to make it useful on my network.
However, I noticed a couple of things that I should have expected, but nevertheless caused me some confusion at first:
1) The default timezone is set to UTC. I had to manually set it to account for the fact that I live on the US West Coast.
2) When I tried to use aptitude, it complained about not having "locale" info. I would have expected default locale to be set to something like "C" that would avoid the error messages, even if some/most users would want to re-set it to their own preferences, later on.
It would be nice if there was a README describing these quirks (and any others I've missed), and how to deal with them after the first boot. Even better would be if there was a script that automatically ran on the first boot that asked a bunch of questions and made the appropriate customizations automatically. I'd be willing to write such a script if someone else would first write the README so I knew exactly what the script needed to do.
Great work! Looking forward to the next iteration.
Enjoy!
Rick
[1] "2021.02.10 11 (Bullseye) 4" https://raspi.debian.net/tested-images/