This is it, the masterful commentary on Buddha's path that is one of the cornerstones of Theravada Buddhism. Although dense and difficult, the effort you put forth to understand this great beast of a book is well rewarded. Read the notes,stop after each paragraph and reflect, and you'll make you're way through. When you're finished, you'll be changed enough that you can go back to the beginning and get new insights on a second trip through.
Everyday, after I get off my meditation cushion, I chew my way though a few pages... It's good to be alive in a time when excellent English translations of this and other great Buddhist works are readily available.
A must have for those serious scholars interested in insight meditation.