I got this lens in December 2006. In November 2007, the autofocus stopped working and was repaired - fortunately at no cost as it was still under warranty. Then, in the summer of 2008 it malfunctioned again and this time it cost $100 to repair.
Now it is not working again. I haven't contacted Canon yet but I am sure they will say I have to pay $100 again to have it fixed. So frustrating!
Has anyone had any luck getting a replacement for something that repeatedly has problems like this?