Actually, ExchangePath no longer accepts Amex. They accept only Visa, MC, and Diners (!).

Customer service is horrible. They froze 200$ in my account (roommate paid a share of his rent) - I e-mailed them, called them (impossible to take a supervisor, half-literate reps just take a message - they do not have access to your account). Finally, I sent them an angry fax to corporate headquarters, and threatened legal action. Got my account reinstated next day - did not receive a call from them though.

In short, waited for a month for my money. I am fairly confident they will go belly up during this year. I doubt CMGI can support them any longer.