I am a professor. Currently, I bring a regular Bible to class when I teach Old or New Testament. I use a wide-margin Bible so I can write notes for teaching. What I usually do is turn pages until I see a note with a line drawn to certain texts and use that as a topic of discussion.
I would love to be able to use my iPad with LOGOS to teach, but there is no margin option. The closes is a reading pane and highlights linked to notes in the text. This will not work for me. I want to be able to have a Bible with a Margin and have the margin scroll along with the Bible. The Olive Tree Bible is the closest, but even there, the margin does not scroll with the Bible, so it does not work. If LOGOS created this option, it would be the first, and it would certainly be popular!