I have very much enjoyed my 100k Amex Platinum. In addition to the benefits SD mentioned (Centurion, two free water bottles at a Hilton
), I've saved quite a bit of money on Amex Offers stuff I would have purchased anyway. Perhaps my fave thing about it is that since the 'Meals fly SW almost exclusively, all SW fees and booze and junk get reimbursed, meaning my two companion passes actually cost nothing.
I also find I share a special bond with other Amex Platinum holders I meet. There's an unspoken "see you in the Centurion" vibe 24/7/365.