I have the 17-40 and I never want to get rid of it. I also have a 24-70 in my bag which I actually use mostly and there was a time I thought of getting rid of it, until I tossed on a ex430 II flash on top of my 40d, with my 24-70 and had to walk around myfiancéesbridal shower. It was sunny outside so I thought, I could get rid of a lot of weight by switching my 24-70 off, so I tossed on the 17-40 and shot all day long with it without a problem. I had some indoor shots that came out great, and the outside shots where the F4 area is at home, the shots came out great as well. I will keep this lens around, just switch out that stupid lens hood you get with the 17-40. I switched it a long time ago with the 17-55 2.8 lens hood and it works out perfect.