Well as you already know I routinely use one in an HH Super Shelter, and I consider it quite successful.
But I have also used it inside the Pea Pod to sleep OK at 10F in that 20F rated product. Plus I have used it a lot under the hammock in the Pea Pod at temperatures not cold enough to need it, just to keep body vapor out of the pod's down. It worked very well for that.
For I consider that the sufferings of this present time are not worthy to be compared with the glory that is to be revealed to us....that the creation itself also will be set free from its slavery to corruption into the freedom of the glory of the children of God. For we know that the whole creation groans and suffers the pains of childbirth together until now.