Mule, have used the JRB Nest & Mt Washington on the BB. Works fine. Not a real winter camper. Coldest I've been down to using the Mt Washington was low 20's. Nest was used as top quilt. Nest as an underquilt required a bit of tension readjustment. Laying in the BB you can feel in between the hammock and the quilt if more tension is needed or wait until your butt gets a bit cold. I think it's best to error a bit on the over vs. under tension . Using the std JRB shock cord suspension to rig the quilts. Didn't notice any draft cooling.