Well, I didn't mention Hipshot, Schaller, or Gotoh (or Leo Quan, for that matter) because there's a lot more out there about them. I specifically chose three lesser known, more boutique-y bridges, if you will. And actually, I didn't assume that the better coupling leads to better tone (I double checked... never said anything about tone). I suppose I did assume that more contact results in better coupling (and I'm no physicist, so I could be wrong...), but I think it's probably a pretty safe assumption.
Brian