This is the mouthpiece I chose in the music store when I knew almost nothing and purchased my first student clarinet.  Six months later I started private lessons and my professor used the identical mouthpiece on his beautiful clarinet.  He retired and sold me that clarinet and I kept his mouthpiece as a spare.  You MUST use #3 reeds with it - nothing softer - to get the beautiful tone.  I use Vandoren V-12 reeds, but everyone has their favorite.