It cracks me up when I see a company that is trying hard to make it seem like the material they are using is somehow special.
Radiant Barrier Foil is just another name for Mylar. You would be better off buying a huge role of Mylar for a lot less, and installing it yourself. Mylar is the same type of material that is used to reflect sunlight on space vehicles.
Check out these auctions
http://www.ebay.com/itm/Lot-of-1000...996?pt=LH_DefaultDomain_0&hash=item53df13851c
http://www.ebay.com/itm/40-x40-x78-...023?pt=LH_DefaultDomain_0&hash=item4cf60dc10f
"In space there is no air for conduction or convection," he added. Space is a radiation-dominated environment. Objects heat up by absorbing sunlight and they cool off by emitting infrared energy, a form of radiation which is invisible to the human eye.
As a result, insulation for the International Space Station doesn't look like the fluffy mat of pink fibers you often find in Earth homes. The Station's insulation is instead a highly-reflective blanket called Multi-Layer Insulation (or MLI) made of Mylar and dacron.
http://science.nasa.gov/science-news/science-at-nasa/2001/ast21mar_1/
It does make a huge difference if you do decide to install it in your attic, if you want to do it inexpensively, just buy a big roll of Mylar, I forgot where I found mine but it has made the difference of my garage being 110 degrees and keeping it under 80 during the summer when it's over 100 degrees F outside. Just the Mylar film works awesome. Not sure I would spend the money on anything quilted or padded though, I don't really think it does. It might be better to lay the Mylar over fiberglass, on the correct side.
I use it in my chicken coop also, under the tar paper/shingles, and seems to keep a lot of heat out of the coop also.
Scott