To presurize or not to presurize

[likes2fly]

A good friend of mine who is a I.A., was my college professor when I took A&P school and has over a thousand hours in a P337. I think his opinion is for all piston driven pressurized aircraft. He warns me not to get a pressurized 337 because it is so hard to keep the pressurization in good operating condition due to leaks. He makes a good argument with all the stuff that goes through a firewall and has to maintain pressure without leaking not to mention the pressurized magnetos.
Now for those who have p337's what has been your experience with them?
I know they would be great to have even if you didn't use the higher altitudes all the time but might not be worth the headache.
Is the pressure coming off the turbo or another device that I can't remember the name of at the moment.