I've been using these boxes for years. They are great for storing past years' financial records or memorabilia. Just used a bunch to pack up a full rooms worth of books and software that we no longer need but aren't yet ready to toss. A box full of books is still reasonable for carrying. Lay flat for storage when not in use but easy to assemble (separating lid from box can sometimes be an issue). Decently sturdy construction although lids can warp over time especially if weight is applied. Can stack 5 high full of books without problem.
These are useful and economical for storage. They are easy to put together strong and they stack neatly. I must have bought at least two hundred of them in my lifetime. They are not good for mailing. We did use dozens of them for moving but we had to tape the tops on which leaves them kind of messy.
I think that these boxes work just as well as the more expensive ones. We use these for transporting books to disadvantaged children and nursing homes. I also like the fact that they are white in color. They are much easier to label and address. They are easily assembled.