I replaced two Canon lenses (18-135 and 70-300) with this single lens, and I'm glad I did. Most of my pictures are hand held, on hikes or vacation, and I really do not want to wear a lot of lenses or change them in the field. During the past year, I walk on a glacier in Canada and cross the Sahara on horseback. Nor is it a good place to change lenses and there were too many times, I missed a shot I wanted because the right lens was in the bag, not on camera.
This is small, lightweight, easy to use. I see no color or shape distortion. I can get the same results handheld at slower shutter speeds with Tamron's VC as I got with Canon's IS.
I have some small Gotcha is, however. One is that the direction of the twist to zoom in is opposite direction of Canon lenses. It took some time getting used to. Another is that the autofocus is a bit higher. It can be a problem for places where silence is important. Third (and last), there is very little twist difference between 200mm and 300mm focal length. In other words, it is difficult to make precise choices at the top of the range. (All zooms are more detailed in their lower numbers, it's just that with a range this wide it is more pronounced than normal.)
All in all, I am very happy with this lens and recommend it to you.
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