I've had this lens for about 7 months now and I've had not a problem with it. I am a professional photographer and this lens handles, portraits, nudes, glamour, landscape, sex act, and erotica with expert care. Its wide angle is perfect for landscape and its 2.8 aperture finds all the curves and crevasses for nudes.
I bought this first hand at an auction and somehow got this amazing deal on it. The auctioneer said that it was previously owned by a Canon dealership that had gone out of business due to financial reasons (bankruptcy).
My primary use for this lens is shooting nudes in my studio. It works great with a master and slave flash and I can't shoot enough nudes with this thing. It is great. The pictures are very sharp. I can zoom in on my nude pictures and find every body part in complete sharpness. That is very crucial in nude photography. I wouldn't be the primary nude photographer in my city if I didn't have the sharpness in my pictures that this lens can accomplish.
Nude photography is all about class and erotica forced together, this lens can really achieve the photographical aspects needed to meet those nude requirements.
I will never switch back to the Tamron AF 19-35MM F/3.5-4.5 I used previously on a different camera body. For those on the fence between these two lenses, put the extra money and get the Canon, its a world of difference.
I don't know why Mlade had to sully this lens' reputation by giving it a "1", what *ocks**k*r.