Haven't heard of it but from the description looks like it's not a clear-bra alternative -- more like a wax alternative. "Protects" only against bugs and dirt. The real danger comes from harder objects, like rocks, pebbles shot onto the paint at high speeds.
I strongly suggest you get the clear bra for your new Cayman before it starts accumulating rock chips. I have it on my black Box S and am very satisfied with it. Did the whole hood, bumper, and side fenders. Take a look:
My triple-black 06 Boxster S
Make sure you research and find someone good in your area to do the installation. 99% of the whole thing is in the installation (takes hours and hours) and I've seen some appaling hack jobs out there.
Hope this helped.
Z.