As for the reliability of these clutches,
just search the internet.
LUK spends untold millions on advertising worldwide, but that does not mean they don't have problems, it means brand recognition and Pavlovian responses!
As for their standard advice, always "driver error", even though the last clutch lasted 100000km and the new one 2000!! in the same car, same application and same drive.
There are untold stories similar to that.
Anyway, do your homework, and things will become clearer!
Here is a handy guide in any case!
http://www.schaeffler-aftermarket.us...ation_tips.jsp