Your opinion - Canon vs. Tamron vs. Sigma 18-200mm lens
I'm looking to upgrade my kit lenses (the standard 18-55m, 75-300mm that come with Rebel XSi's) to what I've heard to be a good walk-around lens, the Canon EF-S 18-200mm f/3.5-5.6 IS. I did a little bit of research and found that Tamron & Sigma also make similar lenses, at a fraction of the price. I know that for that price, there is something to be gained and lost, but I can't say that I'm quite ready to put out for the Canon lens until they get that USM in there.
The main concern I've heard for actually all three of them is lens-creep, which I've never actually experienced. I've also heard that specifically the Tamron produces very soft picture quality.
Does anyone have any experience with any of these lenses?
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