I got one for my 7yo DD because her brother seems to control the TV more. She likes shows like Lizzie Maguire, Raven, Full House, and he is into cartoons, ect. I figure, I can get her some of her shows, and she can watch what she wants, when she wants.
If she didn't have a brother who thinks he controls the Universe, then, I don't think it would get used very often, other than long car trips, but we have a DVD player in the van.
Tough call.