If your looking at buying the Sigma in the near future you might want to ask your dealer if there are plenty available.
I got the last 1 from the Canadian supplier, so the supplies might be limited where your at as well
What can I say about the lens....
I've gotten some wonderful pictures from it.
For me it's perfect for my wildlife shots, including while on my boat.
I actually bought it for birds, and am very impressed with it for that so far.
I am very pleased with it in general, and would recommend 1 for anyone looking at photographing wildlife.
You've probably heard that it's heavy. Well in the beginning it is, but you get used to it quickly.
These pictures were taken with it