I play a Warburton LA 7. I find that because the window is much longer than normal and cause the tip and rails are very thin, the reeds respond better thus allowing harder reeds to be used. I find that this mouthpiece has a very good dynamic range and flexibility, in that it can be played in many different styles. If you want edge use softer reeds, if you want more focus use harder reeds and the mouthpiece delivers.