The Tamron SP AF17-50mm F/2.8 XR Di-II LD Aspherical [IF] is a good lens. It's pretty sharp at all focal lengths, even wide open, but contrast does go up a notch when stopped down from f2.8 to f4. Chromatic aberration and distortion are generally well controlled, though there is noticeable barrel distortion at the wide end of the zoom range. Chromatic aberration is worst at 17mm, though you can see from the test image above that even at 17mm in the corners of the frame it's pretty good. At longer focal lengths you'd need to look quite hard to see any problems.
Via Bob Atkins Photography
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