Sounds like a dream!! Which airline are you flying?
American has it on more flights then most, United has it on a few and expanding as does Delta/Northwest. Southwest does not yet as far as I know and I am sure some others do as well. You should check the airline's website for what types of planes have it before booking if you are interested. for instance American uses the MD80 and they all have it.
Air Tran had it today :) I too was very happy & thought it made the flight much easier!-Brennon