Remember, every club will be different with different ammenities, different services, different sizes (some are smaller than my apartment!)
But for a little investment they are so worth it. Again, if only to escape the crowds and the screaming around the airports.
Another good thing: As suggested by our Friend Rudi, if you see someone outside a club who looks stressed or in need of help who doesn't have a membership, bring them in as your guests on yours. It's what I like to call the International Traveler Goodwill
Pact (travelers help each other.)
One thing I wish my company would do is allow me to pay for my Red Carpet Club membership. I have been fighting since Wanderlust talked me into an RCC membership to get it paid for.
I am told "It's a frivilous expense."