For my money ($2.99), it's worth it. It is easy to set up, and provides a nice menu for selecting books to download from the PC. When the app is run, you receive a menu allowing you to sort your listing of available books. Next comes the sorted booklist. Selecting one of the books results in a nicely formatted page providing a cover image and other metadata (assuming it's in your calibre database). If all you want is a list of books, then it may not be worth it to you.
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