I am a comeback player after 15 years. My level was never so good but not so bad neither, so I wanted to buy an intermediate model for my comeback. After reviewing and searching about various model, I decided to give this model a try. From moment 1, has never disappointed me. Perfect valve action, so called fast butter. Warm, round, bright sound. Super easy blowing. My trumpet teacher checked it in all register , and his conclusion was very good purchase. No intonation problem, all alternate fingerings works fine. I vhose this model over 4335, mainly because valves are from pro 6 series and this model is made in Japan where the quality control is at its best. What can I say, once again Yamaha hit the jackpot.