I use these in my classroom as student mail boxes for returned assignments and papers that go home. My 6th grade students love sorting the mail. It is a fun reward for students who finish early, and now I don't have to think about this task at all.These are expensive, but very durable. I did a lot of comparing before investing (I had to buy 3 sets, so the cost was over $150). I wanted something durable. It looked like I would have to replace the cardboard ones every year or two. I considered the wooden ones, and then thought about how heavy they would be to move around. These are sturdy and light weight. Plus each row comes apart, so they can be customized to fit the height you need. I stacked my 3 sets one on top of another.The only drawback is the paper labels and plastic covers for them. I am using them now, but they won't last. The plastic covers keep popping off. Next year, I will just use my label maker to place names. This is a minor issue, but for the cost, it would be nice to see a better system for labels.