VIO POV 1.5. Yes, I know a little more expensive but you get so much more. It adjusts to light conditions faster. You have a remote you can put anywhere and don't have to push any buttons on the actual devise. Also, the mounting options are endless and it is much lower profile on your helmet. Quality is also amazing.
Here is their site www.vio-inc.com
here is some video I have shot with mine Ross Herr Kayaking
hope this helps