I had a little trouble using my $100 off cert from my Prestige pack so it is more an inconvenience pack but the savings can be decent.
First, all travel need to occur before the coupon expires. I misplaced my pack during the move of apt/hotel room while in NZ last fall and it went even further Missing in action on the move back to Canada. I could not locate it for 2 of my trips in March on CO and finally found it again middle of Apr but it expires May 5th... With a Sat. night stay requirement, I had to rearrange my reserved itinery in order to complete travel by the expiration date.
Second, I reserve on CO.COM but it can only be issued by continental or a TA and the TA I tried to use wanted to charge $60 and did not really want to do it since it was rather complicated so had to bug out of a reunion I was co-hosting to run to the airport for about an hour to get it ticketed. the bonus is that it came out about 14$ cheaper for some reason so at least cover the gas and parking..
I still have the companion pass but don't think I will be able to use it before it expires..
Mary