When changing my QD's for my R1200ST (same as the Camhead GS QDs), I found some very minor cracking. This bike has 66K miles on it, and one hard hit from behind. The QD started leaking, and it was the right time for filming the next Repair DVD, so I took photos and video.
Here are a couple:
The arrows show the location of the crack.
No leaks since the change 600 miles ago!