I have a hero 4 black and must admit it's a great camera, even though I had to have it replaced because the wi-fi module was faulty. It's been working great ever since. The only problem I have with it is the battery life.
Pros:
- great image quality in the field of 360 cameras
- the cool factor is over 9000
- the camera just works
Cons:
- expensive as fu*k
- original proprietary accessories are expensive as well
- battery life