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Colin,
I have owned both. The P model has not been a big maintenance project for me. I had only one abnormal expense relating to pressurization, and that was when we discovered that my windows had been stripper damaged in painting 10 annuals and 2 owners before me. I had to replace all the windows, which was very expensive, about $15K. But that fate should not befall you. Other than that, it has been no different than any other turbocharged twin, like a Seneca for example. I have hand no maintenance expenses directly related to pressurization (as differentiated from turbocharging) in 5 years of ownership, except the windows. Labor costs in generar are perhaps 10% more because maintenance access is more difficult than a Seneca. Another way to look at it is it costs about the same as a turbocharged Cessna single, like a 210, with all the engine related expenses doubled.
The turbos have not been finnicky for me.
Kevin
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