Hey Walt we took it for the first time last month. For us it was train vs flying and renting a car vs driving the whole way. Basically worked out to similar cost to flying and renting. It's about as 3.5 hr drive to the station in Lorton VA. They provide dinner and breakfast on the ride. Dinner choices are 5, 7 or 9 pm, but unless you check in really early, 7 will be gone. Food is like on an airline. They load your car on and the train leaves at 4 pm, you get up the next morning and you're in florida. Gets to Sanford FL at 9am. The seating choices are coach (just a seat), a private roomette or a slightly bigger bedroom with bathroom/shower. The bathroom is tiny like an airline but it's nice having a private room and fold down bed. Don't know what Pat's talking about re: bar car seating - I guess you could sit there all night but they are just bench seats at tables like a diner - not comfortable. Also take into account you are saving a hotel room (for us on a round trip both ways) - it's foolish to try to drive in one shot. One last thing, price varies depending on when you leave, you get a better deal calling rather than booking on line.
Bottom line we thought it was great, had our own vehicle packed with crap (and bikes!). As we will be moving to FL next year we'll use it again. Only negative is the meals they sit 4 people together so you are likely to be seated with a couple of gabby geezers!