It's difficult to get it working offline. My downloaded books tend to disappear and have to be downloaded again. The Enable Offline Reading button simply doesn't do anything. Right click on the book provides only Open book option, the Download and Pin stays greyed out. Continuously misbehaving application, Terrible ugly duck from Amazon

fantastic easy synch to my amazon ebooks.

needs update.more options in the setting to improve user interface

Fantastic! Thanks Amazon, this is preciesely what i was picturing; same layout and options as my actual kindle, same syncing so progress is saved. Excellent work!