My intent, when buying this lens, was to acquire a "super-wide" at a low price for shooting yacht interiors. Because most of my images were to be reproduced at small size in color brochures, I really wasn't looking for a high-performance lens...just wanted something wide at less than Nikon prices.
I've been pleasantly suprised. This is a fine piece of glass that has become my "on-the-camera" lens for weddings and many other jobs. Except for a tendency to flare when shooting into the sun, my images have been sharp and clean, well capable of delivering 16 x 20's from my Fuji S-2 Pro.
I believe it's an excellent value. Although I've heard of sharpness and distortion problems (from others,) I've seen no such behavior.