Glenn
Sorry, I meant the MegaLite. There's one for sale on the pop ups in the upper right corner, and I was thinking about it for the AT in the winter.

Also not sure what the quality difference is between Western Mountaineering and MontBell.

Sorry, the baseline I end up useing for winter sleeping bags is those old Army Down bags I used to spend so much time in. We only threw them out in the 00's because the cotton had degraded too far after 40 years of use - they were falling apart, and no longer useful. I grasp now (after buying a cheap REI bag a couple years ago) that those Army bags were the equivalent of a East German car which was worth less than the steel used to make it.