I have a 1080p JVC action camera, its microphone can't handle the sound of a chainsaw at WOT - it just craps out.
I am so disappointed with that product I barely ever use it.
I have a 32GB memory card, three batteries and an external battery charger for the thing - but a video with bad sound is a video not worth watching/making.
It makes great time scape videos, that is all I use it for.
My Panasonic DMC-TZ5 digital camera and my Sony Ericsson Elm mobile phone will capture the sound of my chainsaws no matter how close they are.
Video quality is lower though but I can live with that.