I have the current card (have a friend in Thailand and use his address).

The room rates are not brilliant, and often the discounted rate for Club Marriott is not as good as normal promotional rates so check out all rates before you book.

I find the value comes from discounted food, which for two diners is 50% discount on pretty much everything you eat in Marriott properties in Thailand, and this can be a great deal in places like Phuket JW where food is expensive.

There are also a few free vouchers for meals in the book.