Had a card and found it invaluable - used it in Jordan following a bout of food poisoning on my way home and the lounge gave me my first decent meal in a few days!
Great to have in 3rd world airports particularly - thinking of some of the african ones I've used here, as the firm has ties to a lot of smaller cities. The other thing worth noting is that in smaller places, you're getting access to a lounge which the majority of carriers would use anyway. Ironically PP can get you into Lisbon lounge, and I remember when unless you were BA silver or above, even travelling J wouldnt get you in there.