I was eagerly awaiting this lens to go with my 20D. In fact, I sold my trusty 17-40 L to get it. There were no reviews early on, so I went ahead and took the plunge.
Man, was I dissappointed -- in the lens and in Canon. I wasn't looking for speed, I was seeking longer focal length options and less distortion than I got with the 17-40. What I got was distortion equal to the 20D and noticeably less sharp images. I quickly returned the lens and happily purchased another 17-40. I'm interested in the focal length of the new 10-22, but will now await reviews before I purchase.