I just got my Galaxy Nexus and put JB on it. I'm really digging it and its super smooth. Google Now is really cool as well. There are so many things you can use it for. The only thing that disappointed me was the screen. I mean I knew going in that it was a worse screen than my iPhone. But there is s horrendous blue tint when I barely tilt the screen.
I sent mine back yesterday because my screen had stains(what Im calling it) whenever I was on a white or gray screen. Also my had ghosting which was driving me nuts. I really loved the phone but after researching about the screens its really hit or miss. Some are purple. Some are like mine was. It stinks because I enjoyed it much more than my iphone.