I had the full PP for about 4 years - free with a UK Amex (plat). The only reason why I had the Amex was for PP and annual travel insurance - it was a great bundle. I've recently discontinued it because I was no longer eligible for the travel insurance and wasn't worth keeping it just for PP.

PP is best suited to the regular non-elite economy traveller. If you fly in C or are elite status then probably you will find the airline's lounge more convenient.

PP works out expensive - bear in mind that some airline lounges allow you to pay cash for entry (this is often not well publicised for PR reasons). By far the best way to get PP is with something else. They are expanding their co-op deals - apart from Amex a number of countries offer it free with HSBC visa (plat I think) and other credit cards. The "full" PP is nice - if you get a version where you pay-per-visit you will always be wondering if its worth popping into the lounge if your intended stay is a short one.

In fact if you've got hours to kill and the "full" PP it can be great fun doing a "lounge crawl" to make sure you've done them all. Some airports have a number of PP lounges.

Not all terminals at all airports have PP lounges. Its best to look around as you travel to see if there are lounges where you would want them. Sometimes its a long trek to the lounge for the sake of a glass of wine only to take a long walk back to the gate.

If you don't see the PP logo, its worth asking the lounge attendent. Sometimes they accept PP but don't want to advertise it (worried the elites will feel their priviliege has been cheapened?). If they don't, they often know a lounge that will take it. Sometimes a lounge will take PP even though it seems not to be in the PP guide.

My experience is that the treatment is always the same. If the lounge is subcontracted they get the cash anyway. If its not they might actually prefer PP people because effectively they bring extra cash.