This is a great lens, but it let me down at the worst possible moment. After 40 years of using Canon I can never fully trust this lens or Canon cameras. I received an error message saying the camera is not communicating with the lens and I need to clean the contacts on the lens, which I have done several times to no avail. I then swapped the battery, disabled autofocus and image stabilization, took the chip out and back in, etc. All I got was a black screen and an error message. Then I removed the lens from my 60D and put it on my 30D and everything is still the same. So here I am, driving a thousand miles from home to get my book after a year of planning. Is it just an anomaly? no My daughter had the same lens and it let her down too. Again, if you're in this position, you'll need a spare lens and body. I don't know what's up with Canon, but either the craftsmanship or the engineering is on the decline. I bought the 60D in April and the flash refused to pop up a few weeks after purchase which Canon fixed under warranty. And by the way, they don't charge shipping costs. Shipping and insurance for 40 miles to a west coast service center cost me $33. Today I'm going to Redding, California to pick out a Tamron lens and my daughter did just that. I will be getting an estimate from Canon for the repair which I expect to be at least $180. If it's too high, the lens goes in the trash can. Much luck.
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