I'm stepping up my manscaping. lol. I bought a "MANGROOMER Ultimate Pro Back Shaver" off amazon. I've only used it once and I already highly recommend it. My back is like a wookie. And this thing shredded through all that hair and didn't pull a single one. No pain and no red marks or irritation on my back. Link for reference:
Its got a rechargeable battery. I was really impressed with it. I'd post before and after pics of my back, but I don't want to traumatize people with my back hair bathroom mirror pics.