This is one of the more innovative and interesting shape sorters on the market. The addition of sound and movement adds to the engagement and is enjoyable for kids in a wide age bracket.
My daughter was given this when she was very young, but probably only started engaging with it from about 6 months. Although V tech recommend it for children over 9 months I do think that they can enjoy it before then- they will just need more guidance i.e. I would put the shapes into the holes and then help my daughter push them through. The rocket will then jiggle around and make a sound. The sounds can be chosen by using the slider on the bottom of the rocket and can be set to say shapes, numbers, play music etc. This is one of the features that make it a great toy for growing with your child. Younger children will enjoy the music settings but older children could benfit from the shape and number settings which help them develop early numeracy skills.
The rocket pops up to allow the shapes to fall from underneath, which again is very engaging for young children and much better than an adult having to take it apart which often happens with shape sorters.
I would definately recommend this product and intend to keep it for future children of mine.