I've owned GoPro 1, 2, 3+, Session 5, and now the Hero8. The difference in image stabilization is remarkable. Note the movement of my head in both clips. Even though the tip of the board bounces a lot, my head looks fairly steady in the lower clip. The color is much better in the Hero8 as well. Top clip shot in 1080P and the lower one in 4K
I left the Session5 on a safari in Botswana. They found it but said it would cost $200 to mail it back! I told them to keep it.