I installed the SSU on a clone and then cloned the clone - boot from flash and clone from SD to SD (N800). I have no bugs to report of.
If you have battery problems, my advice to you is to fsck your cards. As for the Opera browser, people should be aware, and it was stated in the release notes, that this app doesn't behave like the rest of the tablet apps - it doesn't go to powersave mode. Normally apps don't use significant cpu power when you are not using them. Opera uses the cpu all the time, even when you lock the screen. Some apps behave like that as well, like mplayer and transmission.