The wheels easily break the frame. The places the wheels connect are only plastic instead of having metal support in them. The wheels are metal stems. So if you try to roll it especially on carpet, the wheels break the hole where they fit.

The top will bend down if you put stuff on top without a support across the top like a piece of wood, Then you cannot shut the top drawer properly and cannot get the top unbent.

Do not pile them one on top of the other, the sides give and the whole thing may collapse. 

The idea is great, the design is not. I would not recommend these to anyone. I ended up purchasing 10 as I thought they would be ok for my needs. Big mistake. Sorry I bought them in the first place.

If they improve the design by adding metal and more support, then the idea and use would be a lot greater.