I've been flying over 100k miles per year the last 5 years out of Buffalo, and I got to know the DL staff pretty well - they are great - BUT, with the skymiles changes, and the fact that DL now fly's BarbieJets to ATL, and we dropped from 727 service to MD-88, number of FC seats avail has almost disappeared. Oh, for the days with 5 727's a day to ATL, and 3 737's a day to CVG. Anyway, I moved over to NW. Many more flight options per day, and no RPU stopping some "creative" flights. DL first class seating is more comfy than NW, but it's such a short hop to DTW that it really doesn't matter.
One last word of advice: try a Jake's breakfast burrito next time you're flyin in the morning - yummy.