I was given a set (probably wouldn't have bothered buying them) but ds loved them. They are not meant to be interesting to adults, they are designed for babies. I liked them personally for the music ones (Baby bach, etc) as I am a classically trained muso and completely understand the benefits of having children listen to this sort of music (it stimulates the cross-pathways in the brain) but in saying that I would only put on one a day and they only go for 1/2 hour. They do make good baby-sitters when you want to have a quiet shower!