Haven't visited Maui or Lanai yet - I stayed at the nearby Fairmont Kea Lani a few years ago and checked out the Four Seasons while having a meal there. The pool scene was such a zoo that I scratched it off the list as a potential place to stay!
Planning on a trip to Lanai, though - sounds like it's the redeeming FS property in Hawaii, and I love the concept of their airport lounge where you can check in while you wait for your connecting flight, too.