I did a lot or reading before buying my 20D and passed the Rebel knowing something better was on the way. I love everything about the 20D. The EF-S 28 - 55 mm lens that comes with the camera is another story. I am glad I never paid extra for the EF-S 28 - 75 mm.
I bought this lens as a replacement for the EF-S after reading all the reviews on the other Tamron 28-75 mm lens at this my favorite site. Perfection.
While I waited for this lens I splurged and bought the EF 17-40 f/4 L,USM and have used it for three weeks. Great lens.
If you buy this Tamron you will also have a great lens.
The build and over all quality of the " L " glass is the greatest. You get what you pay for. This Tamron is a bargain get one, you will be a happy camper.
Now I ponder between the Sigma and the EF 70-200 f/2.8 L, USM. Is the Canon worth the money. To date my marketing search and information from people like you all, have be convinced that it is.
As I have learned here and there any lens with a 4 rating or better is sure to satisify the amature who wants to be a pro.
Thank you all for your help. For the low price of this Tamron you need to get one, it is a new class way above the EF-S crap that Canon is putting out. Just my opinion.