The only main thing that has improved is the frame rate, and some picture quality, as well as a little battery life. Not worth the $600 in my opinion. I have a Hero 3 and 3+. I'm happy with how they perform. If you're putting videos on youtube or anything, they compress the quality down to 60fps, and to a quality for better playback. Save up for the Hero 5, if they release a 4+ i have a feeling it will be a lot of the same.Anyone here have the new GoPro hero 4? just wondering how easy it is to use/edit and if its worth the money to upgrade from a 3+.