I went against my earlier decision to wait a few weeks after the official release, and upgraded the night 10.04 came out. For the first time since I'm using Ubuntu from 7.04, nothing broke! I mean - network, virtual box, mail everything still worked. My only problem was getting use to the placement of the control box on the left instead of on the right. In terms of speed, I haven't seen any visible improvement in startup, but shutdown occurs in way less time than 9.10. This is the best Ubuntu yet!