Nice! How do you like it?
My last purchase was a Canon EOS 50D.
I bought it primarly as a portrait lens. I was using my 50, which effectively is more like 75mm, but it never performed like a true 75mm. Meaning you get the basic magnification without all the other goodies of a true prime. That said, the 90mm was smooth. I found it to be quite fast with the focus. Now, as a macro lens it'll be used in MF mode. The barrel zoom is about 2 inches, which is a lot for a barrel to move in and out on a macro lens. Probably less so on the Nikon 105mm for twice the price.
I have to admit, this is a good lens. When buying it I told the retailer that I was not interested in flooding my bag with cheap lenses any longer. While I started with some true gems in the film age, as I moved to digital it became price over anything. This is just wrong and I know better. The guy told me that if money were no object (meaning I said I was prepared to pay 2x for the Nikon 105mm) then he would still get the Tamron. I found that interesting because he only knows me for someone to come in, spit out exactly what I want, lay down the cash and walk out. I don't doddle.
As a prime it is great. It served me well the next day doing headshots. I found the bokeh to be nice and smooth, it handled a low-contrast cloudy day very well. I can't complain. I've tried a couple of test macros out but nothing significant.
My only complaint, if it even is one, is that it does focus slightly slower. It is so insignificant though that I can't really tell. If it were searching for a long time (like a 100mm prime I have from vivitar [another diamond in the rough]) then yeah, I'd be pissed.