So while gear has a level of importance, it is not something that should be dwelled on. The gear we use is minimal and I will explain the process of each as they are shown.
I continued to upgrade from one to the next as they came out, until the Hero 3 Black. I upgraded to this because of the improved low-light and have been satisfied with it. I typically sell all my GoPro cameras to get the latest one, and havent found a need to upgrade from the Hero 3 Black. The newest Hero 5 might be worth it to eliminate the need to carry extra housings, as it is waterproof without a housing now.