I have had one for about 2 weeks now and will not look back! At first the rim seemed to have more of a bite compared to what I'd been using... After a few days that sharp feeling went away and now I don't even notice it!
The tone is centered and steady. The mid to lower register is probably most surprising in that it's actually easier play down there even though I think the overall cup volume is less than what I had previously.
The double cup is not as severe as a Parduba but still physically noticeable...
The upper register is easier at lower volumes but maintains a great tone without having to blow your head off to produce that tone.
Great great mouthpiece!!!
I hope this helps!
Tony G