I was at the start of a website build project when the Ubuntu 11.04 update arrived.
I have been an Ubuntu devotee since 2004 and was a real fan!!.
So in early June I decide to upgrade to 11.04, despite thoughts I shouldn't, based on the comments flying around the Interweb!
BIG BIG Mistake! I suddenly found that certain essential plugins in Gimp would not work under the Unity UI.
That was enough of a boo-boo for me.
I had to reinstall my machine so I regressed/slid over to Debian 6.0.
At least, I have much more flexibility to choose my UI and avoid MS Widnows-type evolution of Ubuntu where Canonical are telling me what's good for me!
Don't fix what works....!!!!
Give the user a choice of GUI , IN BIG CAPITAL LETTERS, during the initial phases of installation!
Luckily I have enough TUX experience to customise Debian to my one requirements!
The only way Canonical will get me back is an all-expenses paid return trip to the ISS to celebrate the Shuttleworth visit.... (must be 8 years or so now!) on a Canonical-funded SpaceX Dragon Capsule! (not Soyuz...Roskosmos, after years of great service in the ballistic human field, seem to be going the way of Ubuntu!)