each time I've used a certificate from the privlege pack recently (such as $99 companion or $100 off ticket) I've had to call it in for the reservation, which is on hold until you MAIL THE CERTIFICATE IN at which time they apply the certificate. I end up using certified mail so it's cost me $5 each time.

All in all the privlege pack is ending up to be more like an inconvience pack. Although the 7500 miles that came with the pack were the best bet for me.