got this one yesterday after reading the reviews in this site.
took some shots and im very very happy with the results.
the sharpest lens i own, for sure. it works great with rebel xt. however, autofocus is not accurate in low light and its a pitty its not compatible with full fram bodys.
overall, this is a wonderful piece of glass that you can buy for a nice price.
very good for portraits and for first adventures into the macro world.