I recently had a massive flight issue on CO, they lost my ticket, 10+ hours on the phone attempting to resolve. After issue was resolved, plane was down sized and it was just bad. I requested 1 SWU from customer care. They came back with an offer of two positive space upgrade certs. I tried to use one of these many years ago and could never successfully book a flight on CO. Are these any easier to use now? Or are they only useful for lining litter boxes as a member of FT says. Any input would be appreciated, not sure if I should accept their offer if the certs are only worth the paper they are printed on...and I am kind of insulted if CO offered me something useless for an error on their part. Thanks for any input!