My Hero3 is one of my favorite tech gadgets. Awesome video quality, stupendous battery life, tough enough for bitter cold days in the wilderness skiing. I hope they continue to make good stuff!
I love the Hero 3 too, but I found the footage I shot with it just wasn't that great until I got a quadcopter (DJI Phantom) to mount it on, along with a gimbal to stabilize it. The footage you can get out of a $1000 rig now is amazing.
I wouldn't be surprised if GoPro acquires DJI, or DJI IPOs themselves in < 5 years.