I've flown on them on round trip ORD - Boston. I was looking for a chance to fly on F100 for a long time, and I couldn't be more happy to find this flight - even though my boss told me he hated that airplane.
On the first flight I had the window seat in last row, by the engine and had excellent view of the wing & flaps thru the flight. I've even recorded 40second mpeg during the takeoff. It was amazing to realize how quiet this aircraft was.
In my opionion the interior was very comfortable and spaceous.
On my return flight, I was even more lucky: it was Saturday afternoon, and we had total of 7 passangers on the board. It was roomy!
I didn't regret choosing a flight on F100; any airliner enthusiast should have a ride in this bird.