8 out of 10 points and recommendedLightweight, inexpensive, nice zoom range, sharp when using APS-C sized sensorwide end isn't quite wide enough
I have a Canon 10D. My first two lenses were the 17-40 f4 L and the 70-200 f4 L. The 17-40 just doesn't cut it as a walk-around lens. 40 mm is not quite enough of a zoom, even with the 1.6x crop of my 10D. I also bought a 1.4x extender for my 70-200 zoom.reviewed October 23rd, 2005 (purchased for $300)
The 28-105 fits nicely in between my two other lenses and allows me to keep the extender on my 70-200 all the time. The 28-105 is perfect as a walk-around lens with its light weight and nice zoom range. The quality is just fine, especially with an APS-C sized sensor that crops out the fuzzy edge bits.
Yes, the new 24-104 f4 IS L is tempting, but it costs 5 times the price and the quality is not that much better. With modern digital cameras capable of shooting at ISO 400 or 800 plus noise reduction software (e.g. Noise Ninga), it is relatively easy to keep the shutter at 1/100 th or faster so that lens shake is not a big issue. I don't miss IS on any of my lenses.
If you have a 10D, XT or 20D, consider this lens, especially if you are on a budget. You will not be disappointed. The build quality is very good considering its light weight and the auto focus is silent and fast.