After the initial delay in delivery, I am very happy to own this lens. MHoney packed the product well and sent me on time. I read mixed reviews about this lens from the net. But, as I have started using this, I must admit that I am loving it :-) .For me the variable aperture is not a problem at all and th 2.8 to 4.0 is much acceptable once you start using it. My copy of the lens is tact sharp, and there is no problem with it's AutoFocus System with my Canon EOS 70D. The feel of the zoom ring and the focus ring is also quite smooth. Though reviews say that the focus ring is a bit loose, but I have no issues. Instead, I am loving it!! Highly recommended lens for it's versatility. Great job from Sigma and Thank You MHoney.