That seems to be the consensus. However, I was mainly concerned with noisy AF and hunting on the Tamron. Also, I thought the VR on the Sigma might be useful. The difference in picture quality didn't sound all that much. If I am not happy with the Sigma, I will probably return it and try out the Tamron non-VC.
By the way, since people seem to have problems with Sigma lenses, I would like to do some tests when I get it so I can return it if it's not functioning properly. Is there a good site that explains what and how to test a lens (for AF, etc.) when you get it?