I've had only a couple of complaints about the airplane during my ownership, it was hard to start when hot, and the engine was too loud for my liking. I had the fuel injector servo overhauled, installed a high torque starter, and slickstart spark booster. Now it starts with about 5 seconds of cranking when hot (and just one blade turn when cold).
It turns out the internal muffler baffle tubes were completely shot, I replaced the exhaust with a brand new stainless steel unit in June. It is much quieter, and seems to run better too (hard to measure, but seems smoother and more powerful.) If I were going to keep it, I would increase the prop pitch slightly otherwise it's pretty close to perfect, except for cosmetics. Actually the doorpost, doors, and rear bulkhead plastics are all nearly new, so it's just the baggage area side plastics that need replacement.
Other stuff? Rosen visors, vertical card compass (new), LED beacon, LED nav lights (Whelen), Whelen Comet Strobes, Metco-air wingtips, cam lock cowl fasteners. The fuel system was completely refurbished when the MVP 50 was installed, new gaskets, caps and fuel senders, and stainless structural cover screws, which were installed using anti seize so the fuel tanks can be inspected or serviced in the future without drilling out screws. ( It took us two full days to get the tank covers off last time.)
One really neat about the airplane, the fuel tank feeds are almost perfectly linear. The digital fuel gauges show the same amount in both tanks the entire time, and there is usually less than a gallon difference between tanks when topping off. The fuel vent doesn't leak unless you fill it to the caps on a hot day, and then, only a very slow drip.
