Seems the Baro is set but you can't regulate it like a MPD. I have both by the way. I have my Baro set to open with winds of more then 10 - 15 mph.
Probably most, who pop-poo the MPD, have never had one or if they did, they didn't have a clue how to use it, but they have jumped on the band wagon. I doubt that any can give details of how it didn't work, why it didn't work or what specific problems they had with their MPD. MPD dampers can be found in nearly every hardware store and they don't have a 10 page book of instructions or cautions. Stove manufacturers say not to use them or it will "void the warranty". What does this mean? I don't know, but can only guess, it means the stove "can" run hotter, then with a barometric damper installed to govern the maximum burn in the stove.