The maker is Francois-Louis, who makes some very serious claims for the engineering behind his handiwork. In fact I have one of his tenor mouthpieces, and I like it. However, I tried the bari MP and right away saw that it didn't play as well as the one I'm using. So, with a heavy heart, I'm returning it.
That's too bad, in way. Wind players are always hoping that one bit of new gear - a new kind of reed, a new kind of ligature, a new MP, a new flute head-joint, a new trumpet mouthpiece - will make the crucial difference between the way we are actually playing and the way we would like to play.
If you search for mouthpieces on the Internet, you'll find tons of them, for all the sizes of saxophones and clarinets, for brass, etc. Why are there so many people putting masses of effort into designing and manufacturing what are at best niche products? How many mouthpieces can Francois Louis sell in a year? His company will never make the Fortune Five Hundred.
The mouthpiece manufacturers are fanatics, as are the flute makers and lutanists.
I am immensely grateful to these people who are more interested in making a fine instrument (or accessory) than in making a lot of money. When I was in Boston a couple of years ago, I went to Flutistry to see whether a new head joint would improve my playing. I spent a few hours in a room by myself, trying one head joint after another, until I finally bought one made by Emanuel, and I'm still pleased with it. The head joint I bought was used, so it just cost an arm and not an arm and a leg, but it's very hard to make a head joint, and I'm sure Emanuel makes a lot less than people with less skill and devotion to their profession. Though, for that matter, if he (or Francois Louis) has gotten as rich as Croesus doing what he does, I wouldn't resent it.
For a change I played my heavy, awkward baritone saxophone this morning (this is a picture of the kind I have). I often joke that owning a baritone saxophone is a lot like owning the ball was, when I was a kid. If you owned the ball, and they were choosing up sides, they had to let you play. I play the bari in a community orchestra and in a sax quartet. However, because of the Corona Virus, both the orchestra and the quartet have suspended rehearsals, giving me less of an incentive to concentrate on the bari and more incentive to try out my other saxophones, and even my clarinet. This morning, however, I lugged my baritone out and played it. Every time I pick up one of my instruments (except the clarinet), I remember how much I love it.