I think it's all about what is convenient. I've been in and out of US for years, and had probably 10+ years of CP status. I've seen the good and bad, and just about every b.s. line any airline will throw out there. But for my situation, US is convenient for where I live and travel. By no means the best F product out there, the clubs leave a good bit to be desired, but they're close to me, and over the past year the upgrades as a CP have been easy (even on a last minute booking). With the other airlines I've tried, I've learned 2 valuable lessons; 1. as soon as you think they know what they're doing, the bottom will fall out or they will do something stupid, and 2. don't inconvenience yourself for a particular brand.