I refuse to buy anything from Sigma.
When I researched purchasing my Nikon D80, I tried it with a Nikkor, and then with a Sigma.
The Focus time alone made me buy it with a Nikkor.
It's really sad, I even got it into an infinite focus loop.
Reminds me when I bought my old Canon EOS, and bought it with Sigma Lenses.
I remember how I always used manual focus because I could not depend on the automatic focus to work.
It's always a good idea to 'try' your lenses before you buy them, to make sure they will work for you in your situation in a pinch.
It's horrible to loose out on a picture because your Camera and or brand new purchase fails on you.
