Some serious work has been obviously put I this extension. The PHP code is easy enough to understand, so you can make your own little tweaks. The import function is a life and time saver. especially the csv import. Just create your own id# for each book and get the books ISBN# (ASIN works too) and voila! just select Amazon for the lookup and Title, Authors, Publishers, Publish Date, Edition and other information gets automatically populated. You will have to edit each book to select Amazon and add description (unless you are a MySQL data jockey, so you can do it from the database with simple queries).
All this an more is in the FREE version!! I did not but the Pro because the free has all I need for now. But if Pro is what you want...It's worth the money.
Great Job Guys!!