I changed mine at 55k as preventative maintenance and the one i took out was like new. I only noticed two things, the original one would spin easier and made a slight sound. I was going to sell it since it was in perfect condition, however decided to keep in case I get another Boxster.
It is really interesting how some of these cars go well over a 100k without anything and others have issues. I decided to change mine because I didn't want to be driving in 100 degree weather 150 miles from home and it to go on me. Here are the pictures:
