Sleeping bag alternative

Hi All,
just wondering if anyone has had any experience with http://www.rayjardine.com/ray-way/Quilt-Kit/index.htm instead of a commercial sleeping bag as it sounds almost too good to be true (price and weight) I suppose I’m interested in was it easy to make, decent quality, warm? the good and bad of it.
As far as I can see the only bad thing people have had to say is it does not pack down really small.
just wondering if anyone has had any experience with http://www.rayjardine.com/ray-way/Quilt-Kit/index.htm instead of a commercial sleeping bag as it sounds almost too good to be true (price and weight) I suppose I’m interested in was it easy to make, decent quality, warm? the good and bad of it.
As far as I can see the only bad thing people have had to say is it does not pack down really small.