I used a quilt for a few years, but went back to a sleeping bag because when the night got cold there would always be little draughts. I also move around and rolling from my back to my side always messed up the straps. Even with a hat the neck and shoulder area could get cold and I found that the quilt did not support my arms and I'd end up with them off the sleeping pad and on the floor of the tent.
I changed over to a Montbell UL Superspiral down hugger. It keeps me far warmer than my Jacks R better Hudson River quilt and in't confining at all because it stretches as I move around.