I don't use this lens much but i like it a lot when i need it. My 17-40 took a really nasty drop once. It was in my camera sling bag, i had forgotten to close the bag and for some dumb reason i decided to jump and take a picture, the lens came flying out and smashed into the concrete floor. It was the worse sound ever, the cap flew off, a piece of plastic ring in the front came off but i was able to push it back into the lens. Upon testing the lens, it worked just fine with hardly any signs of damage. It's one tough lens.