ThurnisHaleyI heard action cams were really nice and got really good video quality for what it is. But with that being said i've never owned one and have a hero2 and I really like it. I just don't get to use it a ton.
After playing around with one, the go pro is still my choice of camera, but the zeiss lens on the Sony cam is great and makes the optics slightly better than the go pro IMO. That being said, when it comes to a cam like that, I like a smaller camera and the go pro takes the cake for that. it's also...flat which is awesome for mounting it on your chest and other flat applications
Gopros can film in 4k as well, which the action cam can't...
although Panasonic's coming out with a wearable cam that can film 4k at 30p, the shape's a cool idea as well.