I am using these shelves to hold hand tools, nails, screws, etc., so I am not using it for heavy items.  I like the solid shelves, opposed to wire shelves on another unit I bought.  I don't like they way the top posts have no connection to the bottom posts other than a shelf  being connected to both.  The other red shelf unit I bought had 4 small pieces that aided in connecting the top posts to the bottom posts.  This made it a little harder to assemble and I'm guessing that it may not be as sturdy as the other shelf unit.