i change mine 12 or 18k miles. its easy to change and i dont mind doing the work in the least. so for sake of argument, lets say a cf last 15k miles on a s2+ car (like mine for example). also, an oem cf cost about $50, so if it last 3x longer, than an oem cf would be cheaper. if it last 4x or more, then its cost effective, but how does the cam wear? they say the cf is still softer than the cam and the holes do better at supplying oil, but im still not convinced. they never showed enough info
they need to take a car with 45k miles on it, and compare the wear of the cf and the cam (before and after)... the cam being the big one to check on. even the slightest bit needs to be known.
edit: if you guys do a bench test, please explain the cycles it goes through to simulate real world conditions