Tim,
Thanks for giving that review. Actually, that was the first truly negative review I had heard about it. I knew the focus was a little soft, but I didn't think it was as bad as was given. What do you think about this review (from a professional source):
"When someone is looking for a good quality but affordable walkaround lens, the Canon EF 28-135mm f/3.5-5.6 IS USM Lens is one of the lenses I will often recommend to them. Though this lens gets some professional use, the 28-135 IS is an upper-medium grade consumer lens with image stabilization and a great focal length range.
"The Canon EF 28-135mm f/3.5-5.6 IS USM Lens focuses reasonably fast and very quietly thanks to Canon's USM. Initial acquisition is very fast - the lens then makes a secondary fine-tuning adjustment if necessary for very accurate focusing. ...
"Next to the great focal length range, Image Stabilization (IS) is my favorite Canon EF 28-135mm f/3.5-5.6 IS USM Lens feature. Some debate the usefulness of IS in a shorter focal length zoom lens, but I think it is great. To activate IS, simply turn the IS switch to the on position and press the shutter release half way. You will hear the stabilizer start up (a click and then a continuous hum - they are not loud). The image in the viewfinder will jump slightly (this is an older version of IS - but still very useful) and the viewfinder will become still (unlike camera-based IS). Keep in mind that the version of IS on this lens needs to be turned off when tripod-mounted. Not doing so may cause the image stabilizer to act erratically. ...
"If you are looking for a good value 28mm-something zoom lens and your budget limits you to the Canon EF 28-135mm f/3.5-5.6 IS USM Lens' price range, look no farther. The Canon EF 28-135mm f/3.5-5.6 IS USM Lens provides a great focal length range, reasonably sharp images and IS at a decent price point and in a relatively small package. This is a very popular lens - and for good reasons."
Read the full review at: http://www.the-digital-picture.com/Reviews/Canon-EF-28-135mm-f-3.5-5.6-IS-USM-Lens-Review.aspx. The cons seem to be highly technical, not being outweighed by the pros.