Great deal, but limited to stays by Sept. 30? Wow -- that's an incredibly tight time frame. Having just come off a red-eye this morning, I happen to not need any hotel rooms in the next 2 weeks. If they'd give me a couple more weeks, I could probably find something to book.
EDIT: It's not much, but when I tried to use the promo code outside the booking window, it said it was valid for stays through Oct. 2. So perhaps folks can get an extra 2 days out of this.