Marketed October 2005
Purchased used on eBay 12/2/2006
It failed to operate December 17, 2010 causing a camera error 01. I cleaned the lens contacts and that did not fix the problem. When I looked through the lens I noticed the aperture was not fully open. I tried the lens on another camera and had the same failure. I then went to the Canon website and initiated a repair request.
Received email from Canon on 12/22/2010 with an estimate of $203.56 to replace the lens mount.