I'm just starting Book 2, so you're comfortably ahead Don !
My very general take is that this is really interesting reading, reading it from an Epicurean perspective. If I was reading this with no other background I think it would drive me batty. There's a lot of value in this, but without a grounding in reality it would very easily lead off into the rabbit hole of absolutes. Epicurus did quite a service in building on the reasonable parts and excising the ungrounded.