This is a fantastic toy and has a whole range of great uses. When my son was much younger this was wonderful for his fine motor skills and he spent ages posting the letters, opening the postbox door and getting them out again. The letters are chunky enough that they can be held by little toddler hands easily. Now he is older he likes to role play being a postman and enjoys matching up the letters with the envelopes. The little stamps are removable too which is also a great way of developing motor skills in younger children. The toy itself is sturdy and good quality, I would highly recommend this toy.
I used this with my own baby and niece and nephew who are preschool age. I found it could be used by the different ages children well and in a variety of ways. The letters are sturdy so smaller ones can grab them easily and then there is an extra challenge to post the letters. It is also a you that can lead to imaginative play for slightly older children.