Hi, new member here but just wanted to add my bit about the Muvi. I've had the camera for a few months now, and have absolutley no complaints, use it 5 days a week for 45mins - 1hr per day. I have an 8GB card in it, which means i can store up videos if i can't review them when i've finished with the camera for the day. I'm sure i'll be getting another one, for the back of my bike, as i get a lot of patient drivers behind me and would like to show them on my Youtube channel -
www.youtube.com/policemadad
I can't comment on what other cameras are like, as i've only ever had the Muvi, but i wouldn't hesitate in recommending it, it's good if you're on a budget.
To add, i use a strap i bought with the optional sports pack and have it around my head, with the camera on my forehead.
Happy shopping!