I just moved to kubuntu Gutsy.
It’s very good. It was running well at the first boot, and the ATI drivers were activated in 3 clicks.
Overall (I’m moving from Dapper), the gain in performance and graphics is very noticeable. My computer has never been so silent and so fast.
There are still two small glitches:
I can’t put my computer to hibernate. Well, it does hibernate, but I can’t expect it to wake up.
Here is the Ubuntu bug to watch.
Dolphin. I don’t like it. I have gotten used to the unique features of Konqueror, the copy To action, the tab support.
Feel free to sign the petition to have KDE 4 offer the user to choose his own file manager.