I had a Hero3 Black edition, the top of the range one (at the time) bought it as end of range (just before the 3+ was launched).
Didn't use all the features, hell, barely used a fraction of them. And it chewed batteries (less than an hour), picture quality is good once you get a "good" setup for what you are doing. Handlebar mounting is cack unless you ride root free trails. The bouncing is enough to induce travel sickness......
Have helmet and chest mounts now.
Also give it to the twins to wander round with, get some good footage of them doing kid things.
It eventually packed in after 18 months, i suspect being hurled at the floor by an over active toddler did for it, the shop i bought it from replaced with no hassle, but i opted for the 3+ silver. Now get nearly two hours use, still don't use half the features...... If they hadn't replaced it, i'd have bought a new one. No question.