Does anyone have any experience using a sort of “book holder” thing like the one seen here? As I was googling, I came across several different varieties, but I’d love to get some user testimonials if anyone has used things like this before.

Basically, it’s important to me that the holder won’t ruin the book, and that it’ll be easy to turn the pages. I want to get something like this to make it easier to read while riding my exercise bike. I’ve got a table that I can set stuff on and still ride, but I still have to hold the book open. My table actually works great for reading manuscripts since the pages can lay flat (and the table angle can be adjusted), but for books it’s not so great. I figure a holder might be the answer.