I bought the Fly6 about 1.5 years ago. It's ok as a rear-view camera. Unlikely it would capture the face of a driver behind the wheel due to windshield glare.

I was a Kickstarter backer for the Fly12 and got mine in June. The one sent to me stopped working about a week in. Cycliq has excellent customer service and sent me another pronto, even before receiving the defective unit. The second Fly12 has been running like a top.

The Fly12 is too large and heavy to mount on a helmet, so its on the handlebars. Helmet mounting is better in my opinion as you can pan the camera to take in more surroundings. Road vibration is not an issue but uneven pavement is a problem for clear video (this is normal for any camera).

Both the Fly6 and 12 have excellent battery life. My longest ride to date was 5.5 hours and the batteries were at approximately 25%. That's using flashing light mode for both. The microphone is not much to be desired on ether the 6 or the 12.