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text book rental?

I just heard about some websites that you can rent college text books from for a fraction of the cost. Sounds great and all but I can't find any reviews on any of the sites to see if it is to good to be true type of thing. Has anyone used Chegg.com or Bookrenter.com? And if you have what do you think about it? Is it worth it? Does it even save any money? Do the books arrive in a timely manner?
I'd love to go back to school. Bumping to see if anyone can review. I have a friend starting classes again in the Spring.
Lol