Nunatak Ghost/Special vs. Summerlite

My sleeping combo at present is a 1/8 Thinlight and a Nightlight with a Ghost. I have used it and have been cool but comfortable below freezing. I should add that if it looks like it will be windy and cold I will also take a BMW Nano Bivy. I turn alot as you do and the wind can blow under.

I own (and use) a Summerlite and a Specialist. I have found the Specialist to be warmer than the Summerlite, provided I keep the opening underneath me. I have woken up a few times with the opening somewhere other than against my pad, which is not too fun if it is near freezing. Not too big a deal to adjust it and go back to sleep, but if this happened multiple times a night, it would be annoying.

The Specialist is really more versatile, and allows me to sleep comfortably at warmer temperatures… but the Summerlite is less of a hastle if u toss and turn.

FYI, on my scale, the Specialist is 17.2 oz and the Summerlite is 19.2 oz (both regular length).

I sleep in a ghost with the same pad combo as you but I do the tarp/bivy thing year round. I also use the micropuff as my only insulation piece. I've been down in the upper 20's a couple times with this set up. The first night my legs were cold all night and I slept poorly. Ever since I make a large leaf/pine needle bed and slept with my pack under my legs and am fine. On warmer nights a quilt is the best because its easy to get your legs out or completely uncover.