The previews of books in the Logos store are very limited. At the bare minimum, the full table of contents should be provided for every book; a short contiguous sample of a chapter would also be good.
Repeatedly I find myself going to Amazon.com to get a better preview* of books for an informed purchasing decision. FaithLife, do you really want people to visit Amazon before deciding to buy from your store?
(*And for better reviews. You all who keep giving an automatic 5-star rating to each and every book--please stop that.)