Working for a dealership that carries both Porsche and MB, the newer Porsches should not even be compared to the new MB's in terms of reliability. Cars are SO much simpler electronically speaking. The rear main seals leak on pretty much all of their cars and the airbag systems are a little fickle, but otherwise, they are incredibley robust cars that love to be driven. the boxters (even the S) have no real "power" to speak of, but are fun cars to toss around. The 911's have chassis engineering that make even an AMG prepped MB seem flimsy (it is a purpose built sports car though, and rides NOTICABLY rougher). Labor rates are very high (we charge $40.00 an hour more for Porsche than MB) but parts seem to be pretty reasonable (a subjective observation). Definately not for everyone, but a great car in and of its own right.