First of all SgtRyan, welcome to the Cape Fear area!
Agree with the general program pro/con analysis of the previous posters, but just wanted to throw in some general comments about ILM. For a city our size, it seems there is a high proportion of Chairmen on the flights. Even times that you'd think would be off-peak, I've seen other Chairman sitting in the back. Recently, I've noticed several paid first seats taken when I go to book my trip 1 -2 weeks out before the upgrade window opens. If you're really looking for the upgrades once in a while, the new mileage upgrades might be your best bet.
We currently have mainline service 2x daily, but it looks like it drops off the schedule in March. I have some flights booked out over the summer that still have it, but we'll have to see if it sticks.
Interestingly, Jacksonville just picked up daily DCA service while it's still Sat/Sun only for us. Also, DL will be taking over the 3x LGA service this summer.