I've been using a Klymit Intertia X-Frame since spring and I like it very much. In cooler weather, I'm putting it on top of a Poncho liner inside the hammock. It's kept me toasty warm down to the 40's with lots of wind.
However, I was looking to lose the extra weight and shiftiness (is that a word?) of the poncho liner, so I picked up the Klymit Static V insulated pad. It has an R value of 4.4 and due to the shape of the baffles, conforms to the shape of the hammock very well, even when fully inflated. I did a test hang for comfort last night in the backyard and found it very comfortable. It's easy to get on and doesn't slip around due to the fabric texture of the underside. I'll camp with it this weekend.
I'm hoping that using this pad, and a 3/4 20 degree underquilt (thinking about the Phoenix) will get me 3 1/2 seasons. The other 1/2 season I can stay at home and long for better camping weather ;^} For added insulation too, I can slip a reflectix pad between the bottom layers of the hammock.
For $89, with the insulation value and hammock friendly shape, I think it's a winner in the pad department. It's bigger (72" x 23" vs 72" x 20") and lighter (25 oz. vs 32oz) than the Medium Exped Down 7, insulates pretty well (R4.4 compared to R5.9 for the Exped), and less than half the price.
I will report back after the weekend. Anyone else use the insulated (or uninsulated) Static V?