I remember being a UM - felt very special with the huuugee Red and White tag and a bulkhead row to myself on an ATP ! I think i've still got it somewhere along with my skylflyers logbook. I remember I got a keyring with my miles, and was only a few more flights away from the next goodie when they stopped it..

Hasn't been mentioned in this thread but think someone said before that the seats are blocked so that they can ensure a UM isn't placed next to a male passenger (or is it a male passenger travelling alone..)