I installed it today on the 1.3 GHz Celeron. I did very little testing, but all hell didn't break loose and it looks like it'll be okay. I lost some of the icons for the launchers I had added to the Panel. I restored the icons (actually, found them and put them back).
I'm not real happy that right-clicking on the desktop no longer brings up the Desktop Menu immediately. I have to click on the bottom of the menu in order to get to the Desktop Menu. So I have to do more mouse movement. Not the end of the world, but you win some, you lose some.