I would consider PP except that on int'l flights I'm usually in F/C, which allows me lounge access anyway, and on domestic flights I'm member in AA/UA/DL clubs, and there are few major aurports that don't have atleast one (although sometimes they can be inconvenient).

The website lists locations, but not actual clubs. If your flight is in Terminal A, and the lounge is in Terminal D, it may not be that convenient.

Another question...Are the int'l clubs usually run by a specific airline (such as a BA Executive Club) or one of the joint clubs that several airlines use (the latter type often have worse amentities than those directly operated by an airline, in my experience).

It's not worth it to me, but it is a great idea.