I have the original version of this lens, and generally, I like this lens. Not easy to control, even on a 1.6x camera, the angle is pretty wide and distortion can be very visible if you are not careful. This version of the lens has 3 built-in filters, and external filters (82mm) can be attached to the hood but will vignette on full frame.

This lens is one of the few ultrawide angles that's actually quite good. I had a Spiratone (Vivitar) 18mm f3.2, Vivitar 19mm f3.8 and the Tamron came up better almost in every way. It's a very nice little lens.