[Koha] Comparing book cover services

[Stefano Bargioni]

In Koha, book jackets can come from Amazon, Google Books, Syndetics,  
Baker & Taylor, LibraryThing or Babeltheque. In my production opac  
(not Koha) I'm using covers from openlibrary.org.
I'd like to know experiences, opinions, comparisons, ... about these  
services.
Thanks to everybody.
Stefano
--
Dott. Stefano Bargioni
Biblioteca della Pontificia Universita' della Santa Croce - Roma
"Si apud bibliothecam hortulum habes, nihil deerit" (Cicerone)