I've loved the GoPros ever since they first appeared. Last time I was in Africa, I had them mounted all over my Land Cruiser, adding a unique perspective to my trip video.
The problem has always been that the GoPro output has lots of small problems: lots of linear distortion, no stabilization, lots of rolling shutter, noise in low light, and the impacts of a not-perfect auto exposure system.
Enter ProDrenalin, a US$50 software package (Windows only) that does all that and more (e.g. rotates the video if you mount the camera upside down, which is sometimes the best way to get it where you want it).