Tamron SP AF 28-75mm f/2.8 XR Di and 10D

Whats your experience with this lens on the 10D?

I find sharpness very important.

It's small and light considering the 2.8 aperture. The AF is fairy fast and quiet, sure you can hear it, but it's not annoying/loud.
Optics quality ... Well, it's excellent from 5.6 and up and very nice at 2.8, however my 70-200 f/2.8L produces MUCH sharper images at 2.8.
Overall I'm pleased with it so far, you can see some samples here and here (first 6 pictures).

I used one on a 10D with my CF card at my local camera shop once and looked at the images afterwards:

1.) Slight Yellow Cast
2.) Usable @ f/2.8, but agree with Olegis that it doesn't become sharp until around f/5.6 (although i've seen some sharp photos at f/2.8 on the net--could be some variation problems between copies).
3.) Contrast was ok, color saturation was good.

For the money and if you get a good copy, then it's a great value.

-hza