I don't think the Q Core was the questionable one - I thought we were talking about the BA Air Core and the NeoAir.

Just got back from another night on the old NeoAir. I took a newer one (someone abandoned it in a campsite, I hauled it home) and it turned out to have a slow leak, so out comes Old Faithful. Used it on a polycryo ground sheet with my quilt and a torso length bugnet on two warm, clear, starwatching nights. Still no crinkling. Nor was there any from my two friends' NeoAirs. (The third friend had a Z Rest. Now, talk about quiet. Unless you count the complaining about how uncomfortable she was...)