Just a little head's up.
I have owned an Amazon Kindle Fire for about a year, and had BOUGHT digital copies of many books. These were not free downloads or trials, I actually bought the books.
Last week Amazon decided, for whatever reason, to redact my access to all my book because they "are protected by DRM." Truly: WHUT? I am not having much luck with Customer Support, who declare themselves stymied by a problem "We have never seen before, not once!" Yeah, sure. I believe that one.
This is why I dislike "clouds." Be aware that anything you have on your Kindle can be yanked away at a moments notice, and when you mention the idea that perhaps they owe you some money for your books you PURCHASED, crickets begin to chirp.
Just sayin'.