Raffles

You can only use it at hotels, and it is treated like any other credit card. All establishments that accept Amex are coded in the Amex system, and if you try to use the card at an establishment that is not coded as a hotel then the card will be refused. Sometimes it will work in a hotel restaurant if you pay directly instead of adding it to your bill, sometimes it won't. LOADS of posts on this from 18 months ago when they did a global '50% off' promo.

Remember that they are fiddly to use at hotels which bill in a different currency to the Amex card (in this case US$) because you cannot be sure how much to charge to the card before hitting the limit. You will also be hit with Amex's currency loading fee of 3%.