MJ,
I've got three young boys so it's mainly to keep them entertained on long drives... Shrek, Monsters Inc, Willy Wonka, The Emperors New Groove, Repeat
We drove to Sydney recently and it was excellent on the way... We hired out about 6 DVD's and it really helped to pass the time... We do quite abit of travelling as the nearest relos are about 4 hrs away.
But wank factor 110% for sure! Only reason I did it in the first place was cause a mate has a V8 Soarer with a dash screen that he got working with a DVD player... Then he got a roof mount as well! The effect on his kids was astounding... And I couldn't let him outdo me
But day to day - we don't even turn it on... When we're travelling - it's worth it's weight in gold considering what it cost me.