Bests & Worsts Reviews from Amazon

I have been using this lens for a week and getting absolutely flawless pictures - no flares, fringing etc. I also did some semi-controlled tests with Image Stablizer and it works as advertised, resulting in much sharper pics indoors. USM focusing works great too, and the lens is/feels well built. One gripe - at $600, I would have liked it to come with a hood ("sold" separately but not available yet) and a case (also "sold" separately). The real question IMO is not whether it's a great lens or not, but whether it's worth $600 as opposed to the kit lens (EF-S 18-55) + EF 28-135 IS. This combo is $100 cheaper and gives greater coverage on the telephoto end. On the other hand, EF-S 17-85 lens claims to have better optics, circular aperture, convenience of a single workhorse lens and IS on the wide end too. Ultimately it's your call. My take is that if you spend $800 to $1500 on a digital SLR, you owe it to yourself to spend $600 on good lenses (and another $200 on 420ex flash ;-).