I am often complimented on the excellent sound of my Reverso Repetition Minutes with its shaped gongs! Crystal clear and surpirsingly loud for the size of the case -- and in my opinion superior to many other repeaters I have heard (OK, it's not even close to the AP Titanium GC, but then again, what is?).
If I'm not mistaken (and I might be, others please correct me), the shaped gongs and pretty much the entirety of the original Reverso RM design by Eric Coudray was imported into the Master RM -- with the addition of an acoustic linkage to the crystal.
Best,
Gary G