Good macro lens. Who has the Nikkor 105VR or Sigma 105mm OS already,

not necessarily need to change.
I use both lenses on my Nikon D800. From the resolution, the lens is comparable to 105mm Micro Nikkor VR. What the Tamron visibly better than hinbekommt Nikkor, the CA's. But there's probably any other lens better than Nikkor. But I want to emphasize that CA's with a proper software these days at all no problem.
The autofocus of the new Tamron is quickly and quietly. Workmanship is good. VR nailed the picture already in the viewfinder properly fixed (similar to the Tamron 70-300 VC). VR is quiet, quiet like the clacking of Nikkor's, almost inaudibly. In my copy of the AF sits on the point.
All in all, a great macro lens. But since I already have the Nikkor, and the Tamron it is not necessarily look old, I'll probably stay with the Nikkor. The two lenses do not take much.

What I like better the Tamron, are:

- Size (it is considerably leaner than Nikkor)
- Weight. It is 220g (even weighed) lighter than Nikkor

My Recommendation:

- Who already has the Nikkor 105VR, already has a good lens, and the Tamron is not better, about the same. As well as.
- Who, however, would like to establish a new macro lens, can strike without any problems here. However, one should also Sigma 105mm Macro OS look. In my opinion, it is technically resolution at all the best macro lens of the three. At least that was my Sigma the strongest terms of the 3. And also the cheapest (Tamron still costs almost as much as the Nikkor).

Hope I could help you a bit.

Updated on 11.05.2013: as already indicated I had then returned my Tamron. Not because it's bad, but because I had the Nikkor already. Meanwhile, the lens has fallen slightly in price and is more interesting for buyers.