At least it's tweaking able. I had Galaxy Nexus one month, it was nice phone, with nice ICS, nice notification led and vibrations, probably a little faster, but very bad loudspeaker comparing to our phone, the display was somehow... different, bluetooth sound was delayed. Every rom or kernel or radio, including official, caused at least one automatic reboot per day or two. So I decided, it's not worth the price and returned to Photon. Photon is not perfect, but better than GN for me. Maybe GS3 will be better for you, don't know much about it.
Sony Xperia T owner