This is a fine set of Selmer Signature clarinets.  Their sounds are resonant, warm, deep, and offer a good balance of focus, and richness.  Their intonations are superb, and their setups are ready to play.  
 
Selmer Signature clarinets aren't readily known but most who try, come to respect Selmer's attention detail and intonational creativity.  The tone holes are raised offering proper chimney lengths for ideal sound, feel, and intonation.  No other instrument I'm aware of has been so thoughtfully and comprehensively remodeled in pursuit of the holy grail - "perfection."
 
While the Signatures can seem like the resistance is higher to players coming from R13 style instruments, the simple solution is to drop a reed strength, and the end result is splendid.  Just let the reed vibrate, and let the instruments convert that sonic energy into a proper tone - a sound which is complete with harmonics - and then your playing experience will actually seem easier in the end.  Because the reed is lighter, the response improves; the embouchure doesn't need to work as much to cultivate proper balance of richness and depth with ring, focus and response. 
 
Your sound, your feel, and your execution will become more integrated, more balanced, and more pleasurable.  It is a new experience, an experience which might take a moment to cultivate, but once you become acclimated you'll be amazed by the newfound resonance and comfort you'll experience.