I have a Yanagisawa AWO-2 with the Yanangisawa mouthpiece which sounds great but a little bright. I have tried a Rovner Dark, which made a huge difference to the sound, giving a very rich and solid sounding lower register and a fuller tone to the higher notes. It did, however, lose some of the resonance, especially at the higher end. The Rovner Mark III, claims to address that problem and so it does, but it doesn't give quite the same solid low end as the Dark. They both sound good, it just depends which you prefer. I might buy one of each.
I actually bought this ligature for my clarinet as thought it would fit. It does, and I am very happy with the response from it when I play. It has a nice snug fit to the mouthpiece, and the material used seems to sit well when I place the reed in it. Highly recommended.