I must say I'm extremely disappointed.
Last year, just on a lark, I purchased an alto Gottsu Sepia Tone Bebop 6 with leftover stimulus $$$. I thought at that price point, and given the gushingly positive reception Gottsu products have received here, I would get a mouthpiece with a decent facing at least.
I missed the return date because I thought it was me and fiddled around with reeds and ligatures for way too long. Then I finally sent it to Phil-Tone, and he confirmed my suspicions: it measured a .065, and the lay was MUCH too short, causing squeaks all over the range, and making subtones simply impossible.
After Phil did his magic on it, at least it plays now up and down the range, including subtones, and without squeaks, but I also have the impression that there's a basic design issue there: the sound is, well, how should I put it, about the same color as the white mouthpiece itself... I suspect the design because it has definitely nothing at all to do with Phil's work: the other alto piece he did for me was a Selmer metal Jazz C** that I thought was beyond salvation, and it now plays like a dream!!!
So, prospective Gottsu buyers, beware...