I have it and I would invite any brass player to share his/her experiance with it...
__________________
Gloria in Excelsis Deo Soli Deo Gloria
2 Timothy 2:5 And if a man also strive for masteries, yet is he not crowned, except he strive lawfully.
As according to me Yamaha's Silent Brass System offers the advantage of practicing or playing at times, and in places you couldn't before. And offers privacy for those a bit timid about having others hear their not so perfect notes.