Sweet ... now you can get 500 AMEX MR points for each Double Dip stay. Since I take US Airways miles anyway, this is a nice offer since it will still offer me US Airways miles if I want, but will also offer greater flexibility.
I'm waiting to hear from AMEX about how to update my profile for AMEX ... do I use my AMEX card number or Membership Rewards Account number?
Also, it would be nice if you don't actually have to pay with AMEX ...