answer:I borrowed one once, when I had hurt my arm. I couldn’t stand it. The problem, at least with the one I had, is that it had one angle only; not adjustable. So you had to be sitting just so, at the right angle, in order to get a clear view of the book. This was a clear plastic (shaped plexiglass) bookstand with brass hinges. And to sit at that angle, I had to be at a table in a particular way, which wasn’t the way I normally sat. Summary: I can see how it would be useful but it wasn’t right for me.