Pretty good. Works really well  and I like how you cam add things to collections. But  I wish the bookshelf view would work for each collection instead of all books  much like iOS's does. Also would be nice if you couldn't add the same book twice. Sometimes when I add things manually I forget if I added it from x source  and even though the names are the same  it creates a duplicate. Oh another thing that needs to be implemented  NEEDS  is a way to reorganize book positions  for book series and such.
July 09 2015