I'm a Gopro pig and have a bunch of them from hero , whites , blacks 3 & 3+ , Silver 4 & Black 4. The new silver 4 is the killer , so easy to use great image stabilisation and super hi res and great colour & really sharp. The Black 4 is for guys like me who want to milk vision but honestly the GP4 Silver is the one. Check out this video I shot last week in my boat with the GP4 silver on a pole I was hand holding whist driving. Super stable and great colour and the under water footage is amazing. It's way better than the GP3+Black. I'm nothing to do with Gopro it's just good gear.
Play it in HD to see the sharpness.
This video is shot in Pal 25p 2.7K Superview.