Hi! I'm a newbie too! I haven't tried the tamron and minolta 100-200 but as far as I am concerned, this glass really performs well even at night (F4 til 100mm, AF fast, impressive sharpness from center to corners at a stop down considering the price I paid for this) though take note that at 200mm, u have to compensate that f5.6 to get the right exposure. AF noise is much better than the noisy 75-300 of Sony. In terms of weight, it is light unlike the beercan which is pretty heavy because of its metal body.
On the other hand: plastic mount, focus ring turns in AF, and some distortion at the long end of this zoom lens are its negative attributes but overall, the good ones outweigh the bad.
Honestly at first I am disappointed because I wasn't able to deal for an excellent-conditioned beercan, but after I used this glass, I think I still have made a good decision.
As I have said before, I still might look for the magentas of the beercan in the future but you can achieve somewhere near it with the 55-200 through PP. After all, you will still end up in PP for both these glasses.