I recently purchased the SJCAM M10, the guts of it is the SJCAM 4000 crammed into a smaller square to compete against polaroid cube.
I got the one with wifi for a few dollars more, so far I am digging it.
The 1080p quality is top notch... you can see a short video I made with it - default settings no adjustments other than anti-shake.
https://www.youtube.com/watch?v=E_eDPG-vMEM&hd=1Unfortunately the sound quality from this device is very poor, there is a mod to attach an external mic but I dont want to do this.
Note that youtube seriously compresses videos down.. so it doesnt look so great as the original film. It also takes 12MB photos.
Cost $115... with a waterproof case and mounts. I went ahead and purchased a chest mount for a future ski trip.