I am compelled to respond after reading a post about someone w/ a 5970 in the bank with no intention to wear it, and then quality problem w/ PP's that's actually on people's wrists.
I had a few PP myself, a 5070, 5056, and a few others. All perfectly functional, though my wife's 4857 had a few issues. Was a happy camper until my 5056 was back from service. After paying over 3K USD to have the honour of the highly trained Swiss watch makers to service my beloved 5056, the watch didn't come back in perfect condition. They didn't polish my watch. Hairlines, scuff marks were still there. My wife's 4857 came back looking ugly. No proper polishing done. The watch looked uneven.
To add insult to injury, the local agent insisted that PP never polish the watches during service (right, like that's the first time I sent my watches back for service). If not for the sheet of glass between us.....
Needless to say, save those I bought for my wife and my mother, I no longer own any PP. And won't again. The only way one can pass the watch to the next generation is to do what the 5970 guys do, leave it sealed, and lock it in a vault.