I have had one for about 2 years now. Pretty comfortable. I originally bought it with the plan to put cameras on it. It only took me two years to do that but it served it's purpose in the mean time. The flat spots made mounting the camera really easy. I didn't have to do much at all to make the L bracket fit flush. I haven't mounted anything on the top yet.. If you don't have any designs on putting a camera on right away I might suggest a Bonehead for now. I think I might get a Bonhead for my "Non-Camera" Helmet. The Invertigo has held well and with the tightening strap it has keeps my camera steady and helmet in place even without a chin cup.
Bought mine last year and have had nothing but bad happen. First the dial at the back broke and last month while in a sit, the chin cup bolt came off and the cup was smaking me about the head and neck.
i had one it lasted about 4 months dial on the back is absolute crap and once its broken helmet only fits people with huuuge heads also every annoyin twat ( zman ) keeps pressin the button on the back when u r on the load which dosnt help but all in all i think the skydial is a poor design..