we did....booked 14 days next September and we can't wait....I knew about the bounceback offer before our trip so I had priced it all out beforehand and the savings with the bounceback offer we too good to pass up.
During our Jan 09 trip I booked a bounce back for Aug 09, just got back a few weeks ago. Dates and availability were limited, so you have to be flexible with resorts and dates.