Debated checking luggage right up until the part where they said I'd have to pay $15, at which point I figured I'd be okay carrying my overnight bag (which fits fine in the overhead compartments, but which is also filled with books I want to sell this weekend). Not that I can't afford the $15, but it's the principle of the thing. If I had a bag that didn't fit in the overhead, I'd have to pay the $15. What if I didn't have it? What would happen then? It's a despicable practice, and one I'm not eager to contribute to.
Looking forward to FenCon!