After flying Chicago - New York and back via Comair, I can say that it was an okay experience. I did not need anything fancy, just to get to my destination, and Comair worked fine for me. I had purchased my tickets online, at Expedia.com; they usually offer reasonable prices, especially if you book tickets in advance. I chose economy class, so the seat was rather tight, but I didn't mind since it was not a very long flight. For that same reason I did not mind lack of in-flight entertainment; I just took a book with me and read. Light refreshments were served during the flight, as usual - pop, juice, and small (perhaps a little too small) bags of pretzels.
Like I said, the flight served my purpose just fine; however, if you travel for pleasure, I would recommend something fancier as this one is very basic.