I bought this series for my 2 yr old son and a 3 yr old autistic child in my care.
My son was deathly afraid of the voices at first and would not watch it for more than 1-2 minutes without begging me to turn it off or go to bed (yes, it was that bad). However, I turned the volume down a lot (well below the norm), and now he absolutely loves the shows.
Now from an adult perspective... they suck! They're mind numbing, brainwashing, torture! All they do is repeat the same word over and over and over while showing the shape, letter, or color.
I do give them 5 stars though, because they do what they are meant to do. They hold the attention of active toddlers while teaching them something useful. They have helped the autistic child to verbalize and both boys love to watch them. As painstaking as it is for me to watch them, I would still recommend them.