I bought this for my seven year old who wants to learn everything he can about the human body.  He loves it!  In fact,  he played with it all afternoon.  It fits together well.  He loves the squishy parts.  I love that it is a neat tactile experience with some squishy parts and some hard plastic parts.  He READ the book himself!  He hates to read.  He even made a bookmark with body parts drawings to mark where he left off reading.  Definitely gave this product 5 stars and highly recommend it to anyone who has a kid fascinated with the human body.