Its greatness does not come from having the most outstanding ratings--they're very good (4.2 stars (3,302) at Amazon), but not what I'd call outstanding.
Its greatness comes from its long length (338 pages for the ebook), giving great bang for the buck, and from it having a great price, of only $3.98. Yep, that's $3.98 total for the ebook, audiobook, and the syncing benefit! WS deals like that, as you probably know, have gotten as rare as snow in Key West.
Oh, the deal is on Vonnegut's _Galapagos_.
https://www.amazon.com/gp/aw/d/B005IHWBZC.