Wirelessly posted (iPhone 4: Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_4 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8K2 Safari/6533.18.5)
Basically the rule of thumb is
If u pay to Marriott.com : yes
If u pay at hotel : yes
If u pay via agent : no
Why bother risking your points if you can book with same price at Marriott.com?