Title: Good optical quality. Great service
Product review: I had this lens for about a year. Its optical quality is good. Sharp image in both ends of the zoom range. The service of Sigma USA is the best. I got a problem with the HSM of the lens after one year, just weeks after the warranty expired, so I called their customer service to see what they can do. They offered to fix the problem and treat it the same as within warranty. So I mailed the lens to them. To my surprise, the lens is fixed and shipped back to me within one week, without charging me anything, even the shipping. This is truly outstanding customer service.
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