PSM system has been out since 1998/ 1999 as an option on the 996, standard equip in '01 I think..... and personally I have never heard of a single PSM system failure or out-of-warranty problems since its introduction.

PASM might go goofy on us at some point, and even then I wouldn't get too worked up-- necessity is the mother of invention....... several coil-over options already available, widespread pasm failures would drive even more aftermarket suppliers to produce a 'cheap' replacement solution of coil-overs/conventional strut/ PASM !diot-light defeat. Long ago I had a BMW E34 M5 with hydraulic self-leveling suspension-- notoriously error-prone, easily replaced with conventional set-up.