I've had it for almost 5 yrs (part of Plat Amex card which also offers entry to SkyClubs). I've used it multiple times; w/wo Boss. Seat request never seems to be an issue. Last time we used it was CUN (BTW it's a lousy lounge but has improved recently). We each have a card. I think unless a lounge is really nice, it doesn't really pay to take a guest. Some lounges limit access when busy, but I've never encountered one.
Edit:
I went back and found that I've been PP member for 6+ yrs. Who knew??
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