I use ubuntu at work. I have done since 2005 I think.
I have tried every window manager and desktop environment under the sun.
I have tried to like unity.
but its not really good enough for me.
its not that I dont get the metaphor. I like the sidebar on the left, and the swooshy effects, like I have on my mac. its just dreadfully slow.
no, its not drivers. its unity.
when I switched to gnome 3.6 yesterday my workstation came back to life. everything works fast again :)