Bests & Worsts Reviews from Amazon

I eagerly bought one of these lenses earlier this summer (Nikon mount). It arrived in seemingly good condition and the first shots from it looked ok. However, less than 24 hours later, it became virtually unusable due to its inability to auto-focus. Manual focusing produced fair-to-marginal results, so I think something inside the lens shifted out of position. The lens was not mishandled in any way. Lens was returned, other options considered. EDIT: Some people have commented that I should point out that the lens was tested on a D200, which contains an internal focusing motor. The omission of this fact apparently caused some confusion about whether my camera was even capable of auto focusing with this lens. It was. Secondly, it has been suggested that a 1 star rating is too harsh, given that I tested only one sample and that most copies of this lens appear to be very good. To that sentiment I am somewhat sympathetic, but I can only rate what I have seen. I might also point out that many photo discussion boards (DP Review, PhotoNet, Nikonians, etc.) contain reports of defective copies of this lens, so your chances of getting a bad one, while small, are real. In my opinion, the positive attributes of the lens, such as build quality, don't mitigate the fact that it was unusable for its intended purpose. However, if the editing features permit it, I will raise my rating to 2 stars if for no other reason than it would have made an attractive (albeit expensive) paperweight, and thus was not useless after all. EDIT: Raised the rating to 2 stars (for the paperweight factor cited above)