Not sure if this had been mentioned - in addition of the unlimited PP provided, you can also register for the Mastercard Loungekey which also gives unlimited access until expiry date of credit card. 1 accompany guest can enter for free.
I find that their lounge selection is wider than PP and also gave dining discount nice than PP.
Since this is tagged to the Card, I will ask my wife to register also using her supplementary card, so we might be able to bring 2 accompany guests in. For current PP program, her supplementary card is not issued with PP, so she is always registered in as my accompany guests.
From their FAQ;
How does this program differ from Priority Pass or LoungeKey?
In addition to providing access to airport lounges, the Mastercard Airport Experiences provided by LoungeKey program also provides you with dining, spa and retail offers within the airport. Plus, there is no need to carry around an extra card.