I used to use them as teaching aids. I think it's a great lightweight product that gets the job done. However, I ordered two of these sets. Both came in their own boxes but in a large Amazon box. The smaller individual boxes were dented quite badly but the product was undamaged on installation except for the clicker, one of the adult/child dummies was already broken. I don't know if there's a link between damaged boxes and a broken clicker - I doubt it - but I think it's worth mentioning. to go on learning.