I tried the unrooted GB, and dl'd all the files and was ready to give the rooted GB a shot, but I decided against it cus I really missed the stability and speed of Rubix Focused. I had it OC'd, undervolted, and set up perfectly for me, so I SBF'd, and restored by backup.
I just didn't get enough out of GB to try the rooted version. It was slightly laggy, and as cool as the new launcher was, I don't really use the app groups, so it didn't matter to me. One thing I did like about GB, though, was the new text cursor. I thought it was much easier to navigate between letters to edit text compared to froyo. I also liked the new calendar.
Maybe once the rooted GB gets more stable (based on the comments, it seems like a lot of people are having issues with it right now), I'll give it another go...but until then, I'm happy to be back to Rubix =)