Mark is known as one of the biggest and most reputable vintage mouthpiece dealers around. He knows his pieces and is really passionate about the saxophone and finding the right setup for every player. The 10mFan pieces come in three different designs to match different playing styles. The Merlot is the darkest and warmest of the three mouthpieces (the brighter/more projecting pieces are the Robusto and The Boss).
The Merlot is made from German bar-stock hard rubber and the facing/finishing work is done by mouthpiece maker Eric Falcon. His facing work is impeccable (see the video) and the rails and internals all looked perfectly symmetrical to my eye. The main thing I can say about this piece is that it blows very efficiently and makes it quite easy to shape your own sound. The Merlot also has very respectable intonation - as good or better than any other mouthpiece I've tried.
[The Merlot up-close]
[Play-test of the Merlot]