I’m happy to say that I’m on Ubuntu 12.04 with Unity now, and I’ll stay there. There were a lot of annoying bugs, but all of them got fixed when I installed the sru ppa. For fixing a lot of bugs, as the disappearing tooltips at the launcher, just run this command:
sudo add-apt-repository ppa:unity-team/sru
sudo apt-get update && sudo apt-get upgrade
And, finally, enter the Updates Manager, install all of them and restart. You’ll have a cute ubuntu Unity!
I hope it works to you, and remember that I’m Bousie on AskUbuntu also.