I'm not calypso but I love these things (obviously subject to change): 5x MR on flights/flight expenses (taxes, seat upgrades, etc), $200 annual credit with an airline--I've used it to buy gc some years, other years I know I'm flying an airline without status or alliance, I've used it for seat selection/bag fees (Amex allows a change in designated airline every January so my vacation flights are set by then), access to Delta lounges when flying with Delta (a regular member ship costs $495) and access to Centurion lounges in non Delta hubs (recently IAH, in June, PHL).
Additional perks that I don't value highly but others do are the Uber credits and Saks credits (I can use the Saks, but it's not a make/break proposition).
I have DD, DH and DM as AUs (additional fee $175 for 3 AUs) so they can also access Skyclubs and Centurion lounges when we fly. The charge for a skyclub guest is $29 so if my AUs use it or Centurion lounge more than 6 x/year this makes up for the fee. DH has already used it twice, DD once and that's before summer travel and dropping DD off at school, so we'll visit more than 6 times this year.
If I stopped flying as frequently, it wouldn't be a great card, but since I do, it is for now.
I actually have the $550 fee plus the AU fee of $175 coming up and this helped me clarify that the card is still a keeper, so thanks!