Summary: Versatile lens

Comment: Like so many others, I also had a loose lens body. Last year I spent the money and had the lense realligned, tightened and cleaned. It was worth the $65 I spent to have the lense back in pristine shape. As a result, I use it alot as a general purpose lens.
It takes excellent photos and is rapid in the area of focus and adjustment. I personally think it is worth the money....just make sure you have a tight one.

Summary: Great Lens for the money!!

Comment: I would highly recommend this lens. I bought this lens specifically for a trip to San Antonio, TX and the lens did not disappoint. I took some of the best shots I have ever taken.

The only drawback is...the lens will extend while the camera is draped around your neck and walking. Small inconvenience for quality shots.

DK

Summary: Decent Lens

Comment: From the perspective of a hobbyist/amateur, I can not expect more from this lens. Images are sharp, IS works wonderfully and USM is very quiet, compared to my old Tamron 28-80. No more annoying creeping sounds, just smooth.

One Drawback: When you pair it with a light body camera like my XT, it's gonna suck when you try to put it around your neck and go all day long, it's gonna make you tired very quickly since the lens causes the body to be inclined forwards.

Other than that, highly recommend!

Summary: Outstanding Lens!!

Comment: I couldn't be happier with this lens. Image quality with this lens is superb, bokeh is very smooth. Auto focus is very fast and reliable, and image stabilization makes getting a clear shot easy, even with a moving target. I'm using this lens on a Canon Rebel XSi, and it is now my primary lens. It is far superior to the kit EF-S 18-55mm IS lens, and is a perfect intermediate lens between the kit lens and my EF 70-300mm IS USM telephoto zoom lens. If you need something with greater reach than the kit lens, but you don't want to spend more than $500, buy this lens. You won't regret it.

Summary: Bad Lens

Comment: Shame on Canon. I got this lens as part of a package when I bought a Canon 40D camera. I thought it would be great with IS and all, but I was sadly mistaken. The images are soft and the IS doesn't really help much. Fortunately I still had a Sigma 17-70mm lens that I got for my Canon 350D and I use this lens most of the time because I get the IQ that I am used to getting and the Canon 28-135mm lens is just a great disappointment. I wish I had spent the extra $200 on an alternate lens. I hope someone will want to buy this Canon lens from me. It's the only Canon lens I own and I am sorely disappointed with it. It is in a box collecting dust!