One really cool thing about Android tablets is the ability to use
Calibre Companion. Available
on the Google Play store for $2.99, it is made by a long-time calibre friend and code contributor (and his son's company), and can connect to calibre as a device over wireless connections, among
numerous other helpful things. A must-have for the Android reader.
chaley is a regular here on MobileRead, especially in the Calibre Companion subforum where he cheerfully listens to user input and experiments with new features, but also in other areas of the forums, like the calibre subforum. Great guy, and his contributions enrich calibre greatly.
There is also now a free demo version limited to ten books, which is useful for seeing if you like it enough to pay money.