Earlier quoted context omitted.
I almost consider 11.04 to be beta. Alt-tab to switch between windows is driving me nuts (I'm using the classic interface), the new window gets some kind of focus (titlebar changes) but the keyboard focus doesn't reliably follow. And Ubuntu has jumped on the minimalist, hide previously easily found configuration settings bandwagon. Harumph! (But I still like Ubuntu, overall.)
I have been using 11.04 on my home machine and it feels very solid if rough around the edges. Only problem I had was with FontForge crashing under Unity and working fine with Gnome classic.
I actually don't care what DE or window manager I use, my computer is just a place to hold a browser, a terminal window, and some development tools. All I require is that it stay out of my way and not make me notice it.