As far as ebonite/hard rubber mouthpieces go, I haven't tried a better one. The only reason there is a 4/5 in quality is that my standard ligature, which works on all my other mouthpieces is a little bit too small, right now I can't get another ligature, but it works well while playing, and when keeping it in a cap I put on an old reed, just to make sure it doesn't get hurt. Also I thought it would be a bit too big, but it wasn't! It has such a nice sound in first octave and transition between first and second, compared to my other mouthpieces. I have only tried it with Java Green 2 and 3 reeds, but I plan on trying it with a 3.5 from some advice I got as well as Java Reds.
I would recommend this to anyone!