I love study Bibles. They can add a whole new depth to our Bible reading because of the countless information they contain. There are study Bibles from our favorite preachers, and from good publishers. There are study Bibles that focus on specific aspects; like history, evangelism, apologetics, the Christian walk, etc. There are more broad study Bibles, more in depth, and on and on it goes. And as I said to start, I love them.
But, when does our study Bible's extra biblical information become what we study? And are we neglecting actual Bible study and instead just reading; reading the Bible, then reading the notes? Bible study is essential to Christian growth, study Bibles can help - but they do not replace.