Hi,
I've had two input shafts on mine, the last one being a different model number.
That's about the only thing I've picked up on that's mildly common but expensive.
I still prefer my R11S to the R12S, it just keeps going.
Adrian
http://forums.pelicanparts.com/showthread.php?t=80102&highlight=ownership
99 R11S 138,000 miles.
06 R12S 34,000 miles