So GoPro's are awesome for the money and size, but they have really big issues.
GoPro's basically are horrible if it comes to battery life, heat & sound, mediocre touchscreen..
So basically I bought a mediamod removed the internal battery and added a powerbank USB 2.0+ (the blue usb)
Then I went for the Rodeo videomic they are the best for the money.
Ofcourse i now sacrifice portability but I rarely use that and I can always just remove everything for a skiing video:)