Hi everyone. I now the 70-200 1:4 L IS isn't out yet, but it will be coming out soon. I am interested in buying a good 70-200 lens, but wanted to get everyone's impression on the differences. I was in a store yesteday and compared the 1:2.8 IS vs the regular 1:4 with the assumption that the new IS version of the 1:4 won't be that much bigger or heavier. One thing that was immediately clear is that the 2.8 weighs almost twice as much, if not more. It must change the use of that lens. The heavier 2.8 actually comes with a nifty tri-pod collar that allows a quick rotation between landscape and portrait orientation. My concern is that if I'm dependant on a monopod I will end up getting pretty limited use out of the lens. What would my usage be? Well, a little of everything. Primarily I enjoy taking high-quality pics of my kids, and I like shooting urban landscapes. both those are little bit more "walk-around shooting" than the heavier lens might allow. What has your experience been with these lenses? How have you used them, and seen others use them?