I bought this as a birthday present for my 5 year old son, and he loves it!
It has minimal content, basically a short write up on the key characters in the series. So, I wouldn't say it is essential reading for your child but it will keep them happy enough!
The fun thing about this product is that the 6 books all go together to make a jigsaw, which is a brilliant addition to it just being a small set of books.
I don't know what the full price is, but I bought it 2nd hand, and personally I would feel a little robbed if I had paid more for it.
Overall, I have given it 4 stars, as it is for children and my child loves it. The loss of one star is due to the minimal content.