oddly enough, i've been upgraded on CO with my WP Silver more than I have been upgraded on NW. I think I'm 10/12 with NW & 6/7 on CO (higher percentage on CO). I even scored FC on CO IAH>LAX and back! Never thought that would happen (of course, back was redeye though).

anyway, it's worth it. however, my status expired and i'm back in the boat trying to get back up to silver myself. i'll be doing some mileage runs, if need be, at the end of the year.