When Henri Selmer built his first saxophone, I'm sure he had no idea it was going to be the model that every other company would attempt to replicate. Every horn will be slightly different than the next, but the action of the Mark VI I've played was phenomenal. The keys fit to your finger the first time you pick it up. You can feel, without even playing it, that it is the best saxophone you've ever held. Then you put air through it! I play with a Meyer hard rubber mouthpiece, medium chamber with a 5 tip. On my everyday horn, I would describe my tone as medium-dark/medium-bright, kind of favoring the brighter tone. On the Mark VI, my tone flips to the other side of that line, a lot darker! Octave jumps, low notes, and altissimo are all significantly easier on this horn. A large portion of the early models did not have the high F# key, as the one pictured seems, however the later models did incorporate that. Overall, the money that you will spend on this horn is well worth it. Even the greatest Yamaha will not be the same as the Mark VI. Truly the Pinnacle of Saxophones!