I used this option again this week...but the desk clerk wasn't going to check me in without this coupon! I told him that I've booked this promo several times and never presented a coupon.
I had to go to my room, and fax the confirmation EMAIL that I had from HI in order to receive the rate.
I guess the coupon thing is techically required, although most apparently done collect it.
This week.....$85 per night normal corporate rate.....paid $110 for one night with the second night FREE ($55 average per night).
The other neat thing about this is that they don't show the second night, therefore you don't get hit with local taxes or surcharges for two nights, only one!