The author does an excellent job of clarifying grammar errors in an entertaining way and with excellent tips to remember them by. However, this is something better done on paper that you can refer back to specific needs easily. The thought of listening to this every three months or so as some reviewers have suggested is not pleasurable to me.
..but its as fun as can be, its bearable this way.
I'm not anal about grammar, but I have to learn, so this is a grate alternative.