Anyone have any knowledge

Never heard or seen that sleeping bag before you posted the link - pretty cool looking. It looks similar in style to what Snugpak has to offer.
Dont have experience with that one but I have a coleman canyon 32 which packs down to the size of a loaf of bread and its fairly warm. Kelty makes the light year 25 that packs down to about the same size as my coleman and supposedly it works to its rated temp.
One thing to remember is that those temps are often quoted with the assumption you are wearing thermals to bed.
Sorry I am not more help.
Thats cool looking, but I know I would have a problem getting it back to that size after opening it, I hate getting a normal sleeping bag into its sock.