Im leaning towards getting one, I wish i could get one that opened all the way back but I guess thats not possible...
I have had my first two annoying issues lately and they may be related, no onstar connection from myvolt.com or my phone (onstar have escalated but its been over a week already) and then today I had no stereo sound, start up sound etc etc. had to turn off the car, lock and unlock for it to return... So based on those issues im reluctant to mess with the roof near where the onstar stuff is until they resolve that particular issue, but when they do I really want to look at getting one.