Doesn't some company make an electric specifically for the back? I could swear I read about it in here. It has a long handle on it to reach down to the middle of the back.
The only hair I concern myself with aside from head/face is the back of the neck and I shave that every time I shave my head. Hell, the rest of it is covered by my shirt.
Oh yeah, and then there's the ear hair.....
I am furry and an amateur bodybuilder. I use the Mangroomer for my back, and electric shaver with an extending handle and Hyro-5 for my chest, arms, etc..
I bought a Remington Electric Razor with an extendable handle & several attachments at Target. Does a good job. That Easy-Razor looks interesting.