I tried one awhile back. Good mouthpiece - plays very free, very balanced. For me however, and several other's I've talked to, not enough resistance. To "easy" to play in a sense. But certainly a good mouthpiece. I've only been able to try one, so that's my only experience. I play a fairly large link with a wedge in it, with 3.5 hard Jazz selects, so I like a fair amount of resistance obviously.

Jody Espina held a mouthpiece clinic in the music store I work in a couple of weeks ago. I had a chance to try both alto and tenor models. I tried the 6* models. They gave an incredibly warm and rich sound and I had an amazing control of dynamics that I can't get with my current mouthpiece. They were expensive however, costing $450 each.