Yes, I attended the 90 minute sales pitch for a vacation timeshare and received the "FREE" cruise just for attending. This was in response to the exact same postcard recieved by jondesu earlier in this thread.
It does not list any cruise lines or blackout dates. It does require us to make reservations at least 90 days in advance and reservations will only be accepted when space is available.
The post card that started all of this stated this was a "Complimentary 8 day - 7 night cruise for 2 in an outside cabin leaving from any major port in the US. We were never told in advance of starting this process that we would be paying all of these fees.
The certificate says it is an inside cabin only. The post card adverized it to be an outside cabin.