I was checking the Debian website until late yesterday (UK time) waiting for Debian 11 Bullseye to be officially released. It had been by the time I woke (extra early) this morning. I upgraded one of my machines (bare metal); as usual no apparent issues even though about 3000 package updates were involved. I have Plasma, Gnome and XFCE all installed. Everything worked just fine except XFCE was sending me back to login screen when I selected it as the session option. So… I purged the xfce4 package, then reinstalled it, and it’s all good again!
Doing an upgrade on a VM running under VirtualBox on Win10 as I type. Hopefully that will run smoothly too!
Update: VM upgrade went smoothly too. Minor point: I ran the upgrades from command line in a terminal window under Plasma. By the time the updates had been done, the DE seemed a little confused and wasn’t giving me the option to restart from the menu, so I had to use a link to terminal from my panel and then issue a reboot command from command line, which worked fine. So far, very happy with it indeed. Boot time definitely seems reduced!