I tried Ubuntu with Unity once... I didn't like it.
Also I found that Ubuntu is really unreliable when it comes time to dist-upgrade, so I went back the old but stable Debian.
Now Gnome 3 is not in Debian stable release and I don't want to mess up my working environment so to test it I installed Fedora16 and I do like it.
- Cons: less customization
- Pros: clean look
I like that you can't put anything on desktop, I saw several times desktops full of icons that actually you can't even see the nice wallpaper they have in the background.