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Title: Awesome value if buying used
Review: I purchased a used version of this lens. I was hesitant about the image quality, because I had read reviews and heard this lens tends to be soft at f/2.8. I was sold on it after taking two pictures with it. This lens is awesome and sharp, and the build quality is spectacular.Also, I've shot with the non-IS 2.8 version of this lens, and I have to say the IS really comes in handy when shooting without a tripod. It noticeably reduces blur. Also, the weatherproofing available only on the IS version is noteworthy.Finally, I would have to say that if you are considering getting a 2.8 version, be it for low light or speed, go with this one if you can find a good deal on it. IS isn't enough to justify the $700 price jump between the USM and the IS version II, but it is for a couple hundred dollars more.I am very satisfied.
