I spend a lot of time listening to start up, running 912s, and shut downs while at OSH. Every year I ask myself why do our RV12is models not sound so smooth like so many others? Is it the Sensinich prop? Exhaust? Aluminum construction? Prop Balance? Any other RV12is flight school owners on this group? A big part of me wants a few more of these for many reasons, however the recent issues I have had with the Pitot tubes and Garmin issue cause me to pause and ask... Will they hold up? What will they look like with 3k, 4k, 6k hours?