The prices are coming down slowly, but be wary of the cheaper models. The difference in display can vary quite a lot. At first I thought they were a gimmick, but this year I am planning to get one for my parents - I am going through all the early photos of my children and scanning them, plus sneak some of the earlier ones of my sisters and me from my parents house and make a slide show for them. Ideally a bigger screen the better but wont be paying over the odds for one.
I do prefer printed photos, but for something like a child slideshow these seem ideal.