I participate in a weekly study of Owen as well as many of my own personal studies. These works are my favorite books in all the world besides the scriptures, but the amount of errors I find in the Logos edition are terrible. I can't believe Logos charges what it does for these considering the amount of errors that even a casual reading will find. Still I believe the cost to be well worth it to have these resources in a searchable form and in a form that can be marked up with highlights and notes.