Well, amazingly, or maybe not, I was 5 for 5 for EUAs/PR2s. As a Silver. In the L fare bucket. The last leg didn't become available until about 3 hours before flight time. Other than that, all my upgrades were (mostly) processed during OLCI.
I really like COs domestic F. Nice seats (partciularly 1AB on the 752), pretty good food (cold plate a little skimpy, main dishes mostly quite good), fabulous selection of liqueurs (yay for White Russians), really good service (mostly), and just general awesomeness. This was actually my first time flying CO in about a year and a half, as I switched to AS, but they started getting more expensive and not as reliable, but it's better than NW or AS's F product.
To be fair, my experience with NW F is limited to about a 25 minute air-time flight, but the seats weren't as nice (A319) and the windows were all scractched up and opaque. On the plus side, I thought DTW was a pretty nice airport, particularly with that express tram and omnipresent moving walkways. Loved the tunnel that connects to the main terminal from where CO lands. Kind of reminds me of the one at MCO (can't remember if it was there or ATL) and someone noted that it was similar to the one at ORD. I'll probably post a more detailed entry later on.