I bought the Selmer Concept mouthpiece in April 2015 and have been using it ever since - firstly on my Buffet S3 Prestige and now on a Buffet 'Senzo'. Although considered a 'classical' style mouthpiece I find that there is the power and flexibility to perform all styles on music. It does sound rather more 'Paul Desmond/Phil Woods' than 'David Sanborn' when playing jazz but the smooth sound is very addictive.
For 'classical' music it is fantastic. At first I found it rather restrictive after a Selmer SA80 C* but increased my reed strength to a 3.5 Vandoren V12 or V16 and it just sings. Intonation is exceptional, the 'altissimo' register is really easy to produce at all dynamics and articulation, even double and triple tonguing, is unbelievable. This mouthpiece is worth it's cost and Thomann was the cheapest supplier by far. Thanks!