I just used it to book a flight - currently have the Southwest companion pass. You have to add your companion during booking unlike Southwest where you can add your companion at any time. Only pay taxes and fees, you don't pay the CIC - so in terms of cost it's the same as Southwest. They updated their FAQ to exclude award flights in addition to gowild, Southwest on the other hand allows use of companion pass on award flights. Process was pretty simple, log into your account and book a flight as you normally would and it will apply the companion discount (ticket + CIC charges). Only other difference from Southwest, it applies to any companion added during booking - don't have to designate one. All your elite status perks apply - I'm diamond. I purchased the discount den ticket - so it works there.