I know this is an old post, but when I read it I noticed that most people have not described in detail what the bridge Dr. Was made for.
First off, all acoustic guitars should have some belly. If it is within proper limitations then all's well. The Bridge Dr. is not made for those guitars.
The Bridge Dr. is made for guitars with extreme belly issues. Issues that make the bridge lean forward, throwing off intonation. Bellied so bad that the bridge is coming unglued from the sound board. Or bellied so bad that the action is way too high or maybe low depending on the exact location of the belly.
My mother has an old Ventura flat top guitar. Is was bellied so bad that intonation was way off, also the location of the belly allowed the front edge of the bridge to sink, or lower, while the back edge turned upward, creating a very low action. Tone was terrible. I was thinking about a neck reset because I didn't truly understand what was happening. I read about the bridge Dr. And decided to try it.
It rotated the bridge to the back which helped the action and intonation, and TONE. Sounded like a totally different guitar.
If installed correctly and for the right reason, THEY WORK! If you don't need it don't use it. If you do, make sure it's installed correctly.
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