I have been reading a lot about hammock insulation, and it sure looks like the underquilt is a good way to go, but there are two drawbacks for me: the price and the price.
Also, I cannot sew, never have, and don't own a sewing machine, and don't have the time or patience to get into that.
I am going to go with the HH Supershelter and just use a plain sleeping bag inside - I hope that will do the trick in the temps I'll be in (around 35F/0C)
On that note, if you ever see a No sniveller for a NoBrainer price, Let me know!!