That sux....my company wants us to use Amex and stay at Sheraton - but since HR person never leaves her desk we were ablet to convince her to adjust policy. Flights and meals must be paid with Amex, hotels we can do whatever we want. Therefore, whenever I am forced to stay at Sheraton (i.e. if SPG is running a nice promo) I will use the Amex, otherwise its Marriott for me.