The quality of the movies is good and well that they finally supports higher framerate in most resolutions.
However, the camera suffers from overheating problems. in 2,7K and 4K can I record for about 20-25 minutes before the camera turns itself off due to overheating problems. The 1080p / 60 fps can handle it in about 1 hour and 10 minutes before shutting down due to the heat (I film the screen and see the message about the overheating so it is not because the battery is depleted).
I have been in contact with GoPro support and is now in my fourth (!) Camera and all have the same problem. The first was the very worst and survived only by 2,7K in about 15 minutes. I've tried 4 different GoPro original batteries and 633X Lexar and Sandisk Extreme Plus memory card. They are both on the official list of compatible cards. Superheater even if I use the house as supplied or not. However, faster with waterproof housing on, of course.
Acc. GoPro themselves so they leave no support whatsoever of overheating if the resolution or frame rate of 1080p / 60 fps, or if you use ProTune.
I may, however, who said the problem was even in 1080p / 60 fps. Additionally, if you run with wireless control of camera overheats the course even faster.
If you only have the camera to record short movie clips or just have it in the water where it is cooling as driving. If you want it attached to the car, especially on the inside where it gets good airflow, so I bought another camera.