Two problems emerged when I tried first my GoPro 4 Black -- fish-eye effect and shaky footage. Fish-eye effect can be fixed to a certain extent by using GoPro Studio by sacrificing some sharpness. The greater problem, however, turned out to be the shakiness of picture when taking it when waking casually. I tried Warp Stabilization in Adobe Premiere but the deterioration in quality was dramatic. Now I'm trying the same with Adobe After Effects but it takes hours to stabilize picture of a 5min clip. The floor salesman enthusiastically offered to exchange my GoPro 4 Black for SONY Action Cam AS100V, which does have internal stabilization as well as improved picture quality (let alone it's slightly less expensive). I like the size and shape of GoPro better, though. Will be glad to hear some thought from experts who have experience with this kind of problems. Thanks.