I changed to this mouthpiece from a crappy generic one, which came along with my YTS-61 when I bought it - the sound was INSTANTLY better!
I almost feel like this helped me go from beginner to intermediate, just by changing the mouthpiece.
Even though this isn't completely true of course, it did help my sound and intonation instantly and took very little time getting used to.
Of course, I haven't worked with many other mouth pieces, but for someone considering upgrading from a generic mouthpiece, this is a great choice!