New feedbooks site. How does it work?

I was looking at the new feedbooks site, and was interested in how it works.

It appears that they loan books. I started to see what I could learn from the site, but it is soooooooo sloooooooow that I gave up.

Attached are some screen shots.

For those that have used the new site, or have looked into it, could you provide some details as to how it works? Do you pay per loan, is it a subscription service, is it a free, ... ?

Looking at the web page, I don't see anything to actually borrow a book, only excerpts.

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