On my 12.1" Samsung Galaxy Note tablet the clip above at 1080/60p looks better than any video from any action camera or cellphone at 1440/30p. Not only is the loud audio recorded well, rolling shutter is also less than what I've seen from most cameras and artifacts when the train is whizzing by are minimal. This shows how important temporal resolution is to the appearance of the overall image, not just the fluidity of movement, which is already obvious. The faster the movement, the bigger difference it makes. The Yi 4K+ footage IMO is head and shoulders above that from any action camera out there.