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

Wow, really, no one here uses or has a comment on this camera?

Peety, I don't have a GoPro so I can't give you a direct comparison. But in watching GoPro videos and Mobius videos it looks to me it will be hard to justify the extra expense, weight and size of the GoPro over the Mobius.

I am very happy with my Mobius.
https://vimeo.com/84807431 Jim

I agree, BTW Awesome winter flying with skis on.
I have been using the mobius for quite some time now and am happy with it and will buy another one..
Went to Moab Utah 2 weeks ago and did some video at Corona Arch with the Mobius..Had some prop vibration so it could be smoother
but here it is.
http://youtu.be/-nkWhsl1Bjw

Wow, I guess that cinches it for me, I am going to purchase a Mobius... looks like it would work well on my planes, Mountain bike, and While snowboarding! Cool!

Edit: I now see that the last post here was over a year ago, so have any of you tried any newer action cams?? would you still recommend the Mobius, or is there something newer and better/greater that is available in the sub $150 range?

Craig.