The great thing about the ebookwise, is that if you pay the $15 for the librarian, you can load all your ebooks onto a computer and download to your device without using the internet. I went on a 7 week cruise and with my supply of plus minus 600 books I was fine. The librarian also lets you convert a lot of formats - not pdf - to the ebookwise format. Reading when your partner wants to sleep is fantastic - 15 hour battery life even after 3 solid years. If you are clumsy like me, it is super sturdy - I have dropped mine a lot!!! Good luck.