Overall good for the money. Honestly can't say its worth the extra 150 or so dollars over the f/1.8 version.
Good Sharpness; Great Bokeh and good for portraits and product photography
AF hunts A LOT; Soft at f/1.4 but corrects at f/1.6 and up; even though its USM it is still very noisy in my opinion and doesnt seem to be able to focus at the 1.5' as advertised the closest I can get is 3'; I might have gotten a bad copy, stil testing it may send it to Canon