If you are a photographer you should have either Photoshop or Lightroom which is a must with this lens. It is a good lens and the better the exposure the less you'll have to tweak, but I have yet to get a shot that I could leave untouched. Hence the 4 out of 5 eggs.
Nice wide angle lens for the price, and with rebate the deal is even better; Seems to focus quickly, and is reasonably sharp from f8 up; Great for HDR shots,and Adobe Camera Raw and Lightroom 4 already have a profile for this lens to adjust for the barrel distortion
Could be Sharper at lower f-stops; Lens cap doesn't like some polarizing filters(doesn't stay on), but no biggie; Chromatic aberration can be strong but the new lens correction tools in either Lightroom 4 or Adobe Camera Raw can eliminate that problem crazy easy.