Dr. G, "complex tone, dynamic response, and responsive to the player’s airstream" is a great way to put it.
Museman, I assumed he was no longer making mouthpieces because his website was down. It's a shame - his website had some interesting information on it in addition to being a place to order his mouthpieces.
JL, I'm not sure where you got this from, but I am most certainly NOT afraid to play the piece because it could get damaged. I play it all the time. I may be interested in finding a back-up, and not necessarily something that is identical, but close. If that happens to be something that is readily available and affordable, that's even better, because then I can recommend it to my students.