I recently purchased this set and I am extremely happy with it. My baby is only 6 weeks old but he responds really well to the pictures in the books and to the mobile. The 4 books contain simple shapes and faces that are either white on black or black on white and the mobile is very easy to put together - I have actually hung the mobile parts off the arches on the baby gym so that he can look at them whilst he plays. The books could also be used as flash cards when he gets older with the name of the shape or object written underneath. This item was a really good price too.