Grab some standard Bach 37's out of the box and compare them. Do they play,feel, and sound exactly the same? If not, they are unique. Why would Bach introduce Chicago and Philadelphia models if there wasn't some kind of "uniqueness" about the original models? Can a Bach be adjusted after-market to change the way it plays, feels and sounds, and if not, why do top-notch players pay for such changes? Just like every human, every trumpet can be seen as unique. It just depends on which lens we look through. Dave has a finely-ground, unique lens of his own. Plenty of real good trumpet-playing folk agree with his focus.