I like the range of this lens as it works well for shooting both events and landscapes. However, I'm not wholly impressed with the quality & results for the price. I am considering selling it and moving up to maybe a 17-40 4L for landscape/nature shots. I don't really notice a difference when using the IS on this lens, so why pay for it? Maybe I could just substitute a 28-105 or 28-200 for event photography, until I could afford more L glass? My setup right now is 20D, 17-85 IS, 50 1.8, 75-300 :thumbdown:, & a 28-80 kit lens (from my elan). 1. Am I correct in thinking that canon will eventually switch to all full-frame sensors and this 17-85 will be useless on future bodies? Or no? or nobody knows, including canon? 2. What are your thoughts/opinions about all of this? Does my train of thought make sense? or will I regret not having this lens, and I just should just quit crying and get a second job so I can buy more toys? 3. If you shoot a digital canon with the 1.6X factor, what is your lens setup? 4. What are your thoughts on buying used lenses? Have you? Would you?