I've had down come through a few different kinds of DWR. I think calendaring helps, but AFAIK DWR isn't necessarily downproof.
But even so, the Wallyworld DWR hasn't given me a problem other than a stray quill here and there...which is what my down bag, the JRB quilts and the PeaPod have all done. So I wouldn't hesitate to use Wallyworld DWR for a down quilt.
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IMPOSSIBLE JUST TAKES LONGER