The Mobius is the next step for the keychain camera but it films in hd.
It will film 1080p at 30fps and is the perfect size to take onboard footage, but you can just hold it in your hand and film.
I just bought one, here is some footage to show video quality.

http://youtu.be/5iT5l3rnBto Combat wing swarm, Filming Many planes in battle near and far shots

http://youtu.be/RhmLn18rryU Snap roll Tutorial, filming a fast moving plane

http://youtu.be/0xgt22Sc6MQ Filmed running down a mountain footpath and then played back in slow motion

Sorry no onboard footage yet..

Does it compare with the gopro ?
What is a good editor to use with the mobius ?
Any tips to get better quality from the mobius ?

Thanks, peety