How valuable is another year of PM to you if you factor in the benefits? If you're not going to fly DL that much, and given your route structure, is it really worth the extra time and money to make PM? PMUs might make a difference if you travel overseas, maybe not. With 600K miles banked, if a CRC is worth it, you can use miles to get the membership. As a GM, in the past couple of years my upgrade success has been about 90% (mostly transcon), and like everyone else I lose lots of 800 segments every year.