Since the PP card with unlimited free access come
free with my Amex Platinum card, it's a no-brainer. ^
I wouldn't consider paying seperately for it, as the cost for the PP card alone (with unlimited free access) comes close to the annual fee of the Amex card.
I also don't really understand the benefit of the $24 per visit plan, as for $24, I'll probably always find a nice bar or restaurant at the airport that offers better drinks or food than what's available in your typical airline "club", especially those in the U.S.