Robert Davis , Apr 24, 2004; 02:46 p.m.
Although I cannot give you an opinion on the 20-35mm version, I owned the 19-35mm version for more than a year. It worked well on my EOS 3 and I was impressed with the optical performance considering the price. My suggestion is, if the prices are similiar, why risk an incompatibility?
A word of advice -- treat the lens carefully. It isn't built very well (which is safe to assume considering the price). My version developed a small crack near the filer ring. It still worked well, but I know dust is getting in there.
Best of luck!