These were perfect for what I needed. I don't load them (I got 2) up with books, just fill the bottom, 2 shelves of each. It seems sturdy, but I didn't bolt it to the wall and wasn't planning to put too much heavy stuff on top, so I have some board games, knick knacks, etc. on the top 2 shelves.
These are lightweight and so easy to assemble. The bars are plastic-y but don't look bad. It will be so easy to move these.