I have had a guarantee work just once for me. I still book a guarantee from time to time, but since the change, as Doug mentioned, it just hasn't panned out for me.
How it did work out was like this...I paid for an H. I was upgraded to a D. I wanted a C penthouse. A C was available. I only had to pay 50% of the difference between the D and the C, about $250 for the week. This was a far cry for what I would have paid for a C.
