Skydiver with 3 GoPros in the family. I started with the 1, got my wife a 2, and then I upgraded to a 3. The V1 is still alive and kicking, but the image quality was so much better on the 3 that I felt like I had to upgrade.

Also, we see new jumpers every year, and the first thing they want to do is start jumping with a GoPro (even if we don't want them to for safety reasons).

I think they're doing a good enough job with new features that people like me will keep upgrading for a while.