I don't have a kindle reading device yet but I am using the free kindle for PC and Android. I read a lot of books it's something my father taught me to do. I tend to read a little bit of more than one book each day and eventually I manage to finish reading a lot of books.

Recently I downloaded the kindle for PC and started using it on some books and it's saving me some money. The books download to my PC in about a minute and their ready to read. Recently amazon came out with the apps for cell phones and I downloaded the Android app. Any of the kindle apps sync between any kindle device you own and the free download versions. So if I and reading on the PC version and then later in the day I am decide I want to read on the Android version, my last read place in the book on the PC is synced to the android version and back and forth.

Now, the free versions don't have all the features of the kindle reading devices you buy and that it why I am saving to by one of them. But, when I do buy it all the books I have bought for the free versions will be automatically loaded in the new device.

There also is a free software program on the internet named Calibre (don't forget to PayPal this guy a donation} that will take virtually any free book on the Internet in any format and install it on your Kindle reading device.