I agree never had an issue and still use my 0* on at least my coldest trips as it is wider than my OWL The Zero TQ and offers a bit of extra warmth (see below).
I don't zip though just use it exactly like a TQ, ram feet in bottom and flop the bag over body, then tuck sides under body.
My bag is a mummy (yours is too I guess) so once I fold the mummy top to the inside, my torso stays super toasty as I have double layers on my chest.
My issue in cold (teens on down) is the zipper. It's colder than crap and a very unwanted surprise on bare skin.
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