I finally had a few minutes to do a clean install of the Gutsy Beta last night and it is looking hella cool. I really like the new default desktop background. I like darker/deeper colors so the the new image really hits the spot for me. Staring at a monitor all day (essentially staring directly into light all day) can be hard enough, but the darker and richer colors are much easier on the eyes (for me anyway).
I love that my printer gets detected and configured automatically. Not that this was hard before by it's one less thing I have to do.
Compiz 0.6, with the nVidia drivers, seems to be pretty solid although I need to spend more time with it to be certain.