I just received this pad today, purchased on eBay. The seller accepted my offer of $15 with free (and fast) shipping. I haven't slept on it so I can't give a proper review, but here is the preliminary.
It's thin, so probably not great for colder weather. It's long and wide enough for me (183cm*55cm*3cm). and has an attached blow up pillow. It self inflated quickly, and has two compression straps that might be able to be used to clip around the foot end of a hammock to keep it from slipping around as much, but the clips I bought to make an "adapter" (it has two male ends at the foot) didn't work out. Comes with a nice stuff sack and a repair kit.
Search eBay for "Blue Connectable Self-Inflating Sleeping pad" and give it a look~ (the picture in the auction does not do the pad justice)
Happy Hangin' all!