Richard Bridge said: "I expect this to make the guitar sound more like a tailpiece guitar rather than a pegbridge."

Which, I am afraid, only goes to show how wide of the truth expectations not based on empirical research can be. Try it sometime.

The effect of fitting the Bridge Doctor in my experience has been to increase both volume and mid-range tonal subtlety without any introduction of nasal tone, although it does take a couple of days for the top to settle down. Not an expectation. An observation.

BTW if you do fit one DO NOT over tighten it-- tighten the screw till the rod seats onto the tailblock (unstrung) then proceed slowly with 1/2 turn increments over several days. You'll get to a point where all is where you want it, bridge is flat, tone is good-- I would then back off a 1/4 turn and let it settle.