I'm a big fan of Coleman Hawkins' dark, airy sound, therefore I was looking for a mouthpiece that is capable of it. D'addario Select Jazz 7M does exactly that. My sax teacher said I improved my sound a lot with this mouthpiece, and I definitely agree. Since I got it, I also started practicing more because I just love the sound I hear, especially in the lower register.
I had to step down from 3 to 2.5 reeds though, but I think I'll change it back once I get used to the mouthpiece even more.
Using it with Rovner Dark ligature and they definitely have some kind of synergy. Highly recommend this combo.
Overall, it's a really great and easy blowing quality mouthpiece.