Being a side sleeper and really happy with my most recent system, so thought i would share. I have used and still use the Xtherm for cold nights. Im a cold sleeper and run the Katabatic quilt. this is a warm setup, but not the most comfortable. Not to mention that i have patched several holes in the pad.
I have 2 klymit pads, one cheap and heavy and cold, and one that is heavy and warm. Both are durable, and have never seen a puncture. Again though, not the most comfortable.
I picked up the new Sea to summit comfort lite. Warm but not the most comfortable for a side sleeper.
My new favorite is the Ether Light XT Insulated. Its warmish, and durable, and comfortable! I paired it up with the Aeros premium pillow. I honestly didn't think i could be as comfortable in the backcountry as I am now. Really love this setup. It is warm, but not Xtherm warm, so for early and mid season Ill be using the Ether Light XT, but for late season, ill go back to the Xtherm.