i upgraded my laptop running dapper to edgy during this night using update manager. all i had to do in the morning was answering some questions from apt, if i wanted to keep some costum config files and a reboot. after the reboot edgy showed up with no problems at all. even wifi via knetworkmanager worked out of the box again.
so i don't understand all the complains, even though i also cant see the often discussed pros like faster startup because of upstart. boot time seems to be nearly the same here.
so what's the problem?