Just to share some experience. This is my 1st time booking thru agoda for a hotel in HK. I paid for everything in Jan 10 while the trip is end apr 2010. I got the confirmation slip as well.
The day I reached the hotel is already 8pm. Guess what, the staff there nearly gave me heart attack saying there's no such booking even after I showed him the confirmation slip. Naturally I freaked out & quite pissed. The staff then said as long as I have the slip, they will have rooms for me. What if there's no rooms left?? The question is how can they make such an error? I already sent in a complain letter demanding an answer.

Btw its standard practice to pay deposit even if you bring the credit card that's used for booking according to the hotelier. They don't even bother to ask for that credit card.