I've been hearing a lot about these, do you have one. Tell me about it. So many choices and I don't understand what it all about. Ad's no ads, 10 gen or 4 or 6 or none, Gigs? Do you have to pay for a service? WIFI or something else? What does it do other then being a reader only? Is it worth getting one? I am using a iPad for my eBook's what will be the difference? I don't want to spend a lot. Let me have your recommendations please. So confused.