one thing I can say is that many of the 1st gen AF-S lenses have developed some form of problems connected to the AF motor.
cases that I have knowledge about (friends/acquaintances,stories from the shop and reading the net):
28-70 (known)
17-55 (known)
80-200 AF-S (known)
60mm (from this thread)
70-200VR 1st gen (1 case, from a repairman friend)
what do you guys think? is it fair to put the earlier 60mm into the "known" list? my friends' 28-70 and 17-55 haven't developed any problems since but then i lost communication with some of them or they have sod their lenses. any opinions?