I bought this lens for 2 years ... The best value that could exist! Excellent optics, autofocus is good for the price. There are people putting too much cons, for example, made of plastic, which rotates external zoom, which is not USM, which is not f: 2.8 ... but also what they want through a lens of less than $ 200.00?
This lens is AMAZING. I never believed that Canon would make an amateur lens with such clarity, and succeeded. I always had to buy L lenses because of lack of sharpness of the lens does not "L" in this aspect Nikon has always been the ultimate in cost-effective.
Retired my 70-200 2.8L IS, and I'm only using this 55-250, and I'll say I do not miss any of that anvil to take everywhere. Yes, I replaced the 70-200 2.8L, someone here will say I'm crazy? If I was ok, but at least I have clear pictures and my back is intact in 10 years ...