Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: It Will Ruin You For Lesser Optics
Review: Everything the other reviewers say about the incredible sharpness, rapid auto-focus and build quality of this lens is absolutely true. What else can you say? It's a truly awesome piece of glass that will leave you wondering why you didn't get one sooner. It will also make it impossible for you to consider buying anything besides "L" series glass in the future. That's the bad part. While this lens is reasonably priced, it stands by itself in that category for "L" glass. Now if Canon would just come out with some "L" series EF-S lenses, they might be able to offer them at a similar price. But for now, this baby's the bargain of the bunch. And don't worry about the 1-stop loss of light compared to the f/2.8 version. Just change from 100 ISO to 200 ISO and you've got the same shutter speed. Worried that it doesn't have IS? Get a tripod! You should be using one anyway. Stop reading and buy it already.
