We also received & booked the email offer. Very surprised since we had two cruises booked (Oct & Dec). The offer included the date that we booked for December (over the Christmas/NY holidays) on our ship (NS). So our TA cancelled our original B2B & then booked the offer. We upgraded at time of booking to a balcony. Even though we lost some OBC awarded with our original booking, the cost was so much lower that it was worth it. As mentioned previously, we did have to pay in full at time of booking. I was surprised to see the holiday dates included in the offer -- ships typically sell out & base prices are higher. Typically, we aren't big spenders on the ship & never go into the casino.