Having never put glass on the back only, I am going from what I read. Glass overpowers the belly, and causes the belly to fail miserably in compression. I'm not being a purist or anything, I'm just not getting why a glass back is recommended when it ruins the belly and turns the bow into a slug. Certainly poor performance from a bow will demotivate a new guy who would otherwise be excited to continue. Thats my only point, why encourage people to fail.