I bought this lens as a 'walk around lens' for my Canon EOS 20D. It performs better than expected and I'm very happy with it. I expected some more visual difference compared to my 20, 28, 50 and 100mm prime lenses.
OK, it is not as sharp and contrasty as the 50 and 100mm primes, but for simple 'point and shoot' work it performs really well. Distortion can be corrected easily by PTLens.
Especially stopped down one or two stops the lens performs excellent.
For this price highly recommended.