I used these in a K/1st special day class program and the students went CRAZY for these things. They are awesome toys. It's amazing to see what the kids come up with and build. Imaginations can really run free and students get SO innovative with these. Plus, they aren't really hard plastic so you can't really hurt anyone with these toys (in comparison to wooden blocks, building logs, gears, etc.). It takes a lot to break one of these pieces, so a set can really last a long time. If you are purchasing for a larger group of kids (more than 2-3 kids at home), I highly recommend buying multiple sets or a variety of sets like this because one order is not enough to go around. Plus, as the kids get more and more creative they use more pieces to add details and such.These are great, great, great.