I'm wondering if anyone has any experience with a Sigma 70-300mm F4-5.6 DG MACRO. I was actually looking at getting a Nikon AF-S 55-200mm f/4.0-5.6G IF-ED DX VR. I wanted it for this weekend, but can't order it until Friday. I checked out Best Buy, but they want $300 for it. So I contacted a different store. They don't carry the 55-200, but they have the Sigma lens for $189. Just wondering if anyone has used this lens and what are your thoughts on it? Does it seem to be a durable lens? Any pics you can share? I'm looking to use it for some outdoor, wildlife/landscape photograpy. And if the lighting is good enough some indoor gymnastics. I still have my 55mm 1.2 to fall back on for the gymnastics if need be. Thanks Also, will this lens work on the D40???