I give it an F+ rating. I fiddled with it, wasted a lot of time with it before I read on my own that you have to first construct the spreadsheet in a Windows computer and THEN You can use this Google Android application on your Android device in a VERY LIMITED way. I'm really bothered that they expect me to go out and buy a Windows computer to use Android. I'm anti windows that's why I bought Android. This is a major failure in my view.