I was in the market for a 17-50 2.8 but I really didn't want to spend the money on the Nikon. So after reading so many good reviews on the Tamron, I went ahead and purchased it. I have to tell you all that it is a nice lens. It AF quickly, the IQ is really nice, and it feels really rugged. I've had it for about a week now, and what few photos I took with it, turned out great! The only negative that I have for it is the lack of a clutch on the focus ring. You have to actually switch it to MF to do any manual adjustment. To Tamrons defense however they did a nice job of placing, and designing the AF/MF switch so that you can easily switch it without taking your hand off of the lens while shooting. I know there are some Canon guys on here that like it, but are there any other Nikon guys that have this lens? How do you like it?