Used to work brilliantly, but since Amazon has finally integrated Comixology into their system, the app has lost major functionality since updating. Smart lists, which made it very easy to keep track of what you were currently reading, had recent bought, etc. are gone. It's made navigating through your comic books much harder. Trying to read them via Kindle is just as bad. The Kindle app for Mac is hopelessly out of date, & the cloud reader is utter shite that doesn't even do collections.