AmEx lounge - what ticket is required?

Anyone been in the AmEx lounge? Did I hear it has free drinks and snacks? Worthwhile? Is it only accessible if we buy our tickets directly through Universal? If so, I need to look at difference in buying tickets elsewhere to see if it is worth it.

If we get our tickets using points from Amex itself, does that count?

Technically you’re supposed to buy your tickets with your American Express card but I’ve always just shown my ticket and my card and they have never asked her receipt.