Bill, they certainly are nice, but the lack of a domestic support network will undoubtedly make them difficult to use. From my perspective, the components that have been the closest to my desired spec requirements have been STOPTECH,
http://www.stoptech.com/, but alas the local guys refused to return my calls and when I called the factory they had zero interest in my application, when pressed I was told that the NRE would be HUGE $ 00,000 !!!!!! to get them on to my '40.
Brian