youll eventually find out that it is not such a good deal, in my opinion a pretty poor one.
It requires 2 nights, so you essentially get $50 off 2 night stay, and you have to pay a fee of $10, so net discount is $40, and not to mention that the prices are a bit inflated, hence no discount at all...
You will come a little ahead when you factor in cashback and/or coupons, but don't forget that you earn no points with the hotel chain that you will be staying at. So not such a good deal in my book....
Marriott 10% off gift card promo is way better in my book.