Super Wide
A great wide angle lens. I have 5 other lenses and this being the only non-nikon/nikkor. This was much cheaper than the Nikon alternative and all the reviews were quite positive. Build quality is excellent and feels like a real nice solid lens.
-Sharp image quality
-very little distortion compared to similar lenses
-great quality
-focus is quite quick on my D7000
-awesome lens for large landscape shots; and I have also used several times for time delay shots at night for northern lights (I work in N Alberta).
-quite heavy
-you will get a shadow when using the DSLR's built in pop up flash because the lens is so wide and large.