So far this has been a great camera. 1080p at 60 fps is FANTASTIC and better than you'll find from equally priced competitors. The image stabilization has been fantastic, better than what I've seen in GoPro footage. I have not found the GPS useful so far, but I can say it works even indoors.
1080p at 60 fps can't be beat for the same money; Sony has more experience and does a better job of image stabilization than anyone
Inability to mount bare camera to a tripod; The competitors have more mounts and accessories available as of now; This may change as Sony continues to sell more and more of these and continue to use the same housing