I love Gnome but was more than happy to give whatever the Ubuntu guys came up with a good serious looking at. After a few days I've now switched back to the classic desktop, I found Unity very slow (my machine a pretty good spec'), I also found the cursor dragging behind as I typed causing me to keep looking up to see how it was getting on!
I couldn't warm to the interface at all, maybe I'm more stuck in the mud than I would like to think but I reckon it's just that in comparison to Gnome, Unity is rubbish.