Are PTV's on a flight a must for you? I must say that on a flight longer than 3 or 4 hours I would have to have one, but for shorter flights it wouldn't bother me. I like just staring out the window as the earth goes by most of the time. :P
I am a news/information junkie though so I would at least have to have a PTV on a U.S.-Europe, U.S.-Asia flight(long flights).