CO is only 75k miles for platinum and 50k miles for gold (*G). On OZ only the bottom 4 booking classes G,T,V, and W earn less than 100% miles and EQM. On CO the nice thing is if you are flying full fare economy you can usually get 150% EQM on CO. With CO you can also earn EQM on anyone in star alliance. In addition, CO does not do award blocking on other carriers like UA does; if it is available on star net, you can usually get it with CO.

I started with CO mid-year this year after getting fed up with Delta after taking over NW and wanting the ability to use/earn miles on int'l itineraries (which isn't possible on YX/F9).

The onepass interface is fairly easy to keep track of your earning/burning and very user friendly for finding open award availability.