Hi all, Ive been using quilts, and Im now looking at Cumulus to get a new quilt. I saw the quilt 450 has a temp. rating of -1 at 710 grams. But the x-lite 400 has the same temp. rating, at only 575 grams! The diffrence seems to be in 850 cuin(quilt) and 900 cuin(x-lite), and in 29/m2 fabric(quilt) and 19 g/m2 fabric(x-lite). My main reason for going with quilts was the weight reduction, but now the sleeping bag seems ligher at the same temp rating! Is there still any reason to go with the quilt 450 and not the x-lite 400? Thanks!