Hi there...
I bought a Vholdr ContourHD GPS 1080p in April. and so far it have worked excellent.
It's small and fit nice on the helmet side, and easy to turn on/off while you drive.
The video quality is good, wide angle it's good. the sound could have been better. It fit nice in your hand if you walk and film
I did test other ones but they was to lumpy or was difficult to fasten to the bike and helmet.
Have not been able to test it fully yet but will do that on a longer ride next weekend.
The only thing i can notify so far is, when you go faster than 65Mph the cam can shake a bit. This can also be because the small wind shield on the SESG.
and the mic in front can record some wind noise, i guess some foam over the mic will solve that..
Next is to order a handlebar mount and universal mount to mount in direct on the bike. A spare battery and some extra sd cards.