Some nice pictures in here.
I also have the Tamron 17-50mm f/2.8 VC (On crop 1.6 body so range is about 27 > 80)
To be honest i am not sure if i like it or dislike it >>
The pictures are sharp and no complaint about the build quality of the lens , sometimes when it's dark it will hunt a little bit (AF) but no real problem there.
Downside however > The color of every picture i shoot seems a little bit "grey" and there could be more contrast.
While a big part of this can be changed afterwards with Photoshop or Lightroom , the final result could still be a little bit better. (Some Canon lenses i tried seem to give you a bit more color and contrast)
Just curious > What do you (all owners) think about the colors/contrast the lens produces? > is it just me ?