Well I just bought one of these from Canon and now I will feel guilty (at least until I do some shooting with it). You see, the problem is I already have the most excellent f/4 IS version and so do not really need this monster. So I have convinced myself that this purchase was an investment, so I should be able to sell it for not too much loss if I should so choose. Fine. The problem is that I am afraid that I wont want to sell my f/4 due to size/weight etc. and will have two 70-200 zooms, which seems more than just a little silly. I am hoping that, after seeing the magic that comes from the 2.8, I will willingly part with my little girlyman zoom, but I think that in reality I am screwed...