I've taken an extended nap this afternoon in my RidgeRunner in the backyard. I decided to do half with the center 4" extension at the head and half without, after hearing some like it more without.
Now, I didn't get a full half and half because I was sleeping so well for the first half I didn't wake up in time. But as I lay here after removing it, I'm definitely preferring it more with the extension. Even though I'm a narrow shouldered guy, I feel more shoulder squeeze and a bit less comfort without it.
Other RidgeRunner owners, what's your preference?