3 out of 10 points and not recommendedGreat bokehSlow and bad focusing, Quality control
Maybe it is just my luck. Got one copy and found the image is a bit soft on my 40D.reviewed July 1st, 2008 (purchased for $425)
Brought back to vendor and do a comparison with another 2 copies. Found that 1 copy front focus, 1 back focus and 1 generally soft (my original copy).
Took back my original copy hoping that the internal part is still tight (that is what the vendor told me) and will be loser after more usage.
Barely 12 hour after that, the lens makes a loud squeaking sound when focusing from infinity.
After that, i returned it and have serious doubt on the QC because 3 out of 3 lens is not performing consistently.
Again, it might just be my luck. Just make sure you do lots of testing on different copies before you decided on one.