Conclusion: I have had this lens for 5 years and before I bought it I was hesitant because of some bad reviews. My copy of the lens has been great. I have never had a problem and the pictures are razor sharp. I use it on a Canon 50D and T2i. It also focuses fast.
Excerpt: This is the same lens I got with my Canon 20D originally. I got one in 2005 and it's been great since. After 8 years, I had a focusing issue with it and needed another lens quickly. I usually shoot autoshows, racing events, traveling in NYC and other citys. I like the range I get with this one. With other choices I'd seen, I still wanted this lens.
Pros: Easily Interchangeable, Fast / accurate auto-focus
Summary: As descibed, mint condition....fast auto focus.....image stablization great in low light. I hesitated in buying due to some negative reviews I had seen, but this lens is terrific. Sharp images through entire focal range. Quality build much better than kit lens. Some distortion at 17mm, but because I am mainly a landscape/nature photographer no problem. I have owned Canon cameras and lenses since the 70's, I have not purchased a Canon product that has disappointed.
Conclusion: I bought this lens in 2005 when I bought my 20D. I use it as my everyday walk around lens and it has traveled with me around the world. Never a problem. Never a hiccup. The only reason I would change this lens is if they made the same lens in an "L" series. If I can tear myself away from it I am going to send it in to be cleaned so I can use it with my new 7D.
Excerpt: I have had this lens for almost 6 years and it is my best friend! It lived in Germany with me for 3.5 years as I traveled all over Europe and even into the sandy environment of Egypt. This lens is a great walkabout lens that can do almost everything, in my opinion. The wide angle is great for the tight streets of Europe and the 85mm is nice for the close up portraits of the locals.
Pros: Consistent Output, Durable, Rugged, Strong Construction
Excerpt: I am using this lens for everyday shooting, mostly candid shots of people and the occasional scene shot. So far it has proven to fit this bill perfectly. The pictures are crisp and bright. The quick, quiet focusing is a joy.
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus, Lightweight