Product review (3 stars): so the product itself is good. Trying to get near the 8' length is ...
Okay, so the product itself is good.  Trying to get near the 8' length is dang near impossible.  It would definitely work better with an extra set of hands as I was alone, but this thing is near impossible to get 100% stretch ratio.  About 50% is the sweet spot, and after that it's extremely hard to stretch this out without either a.) denting the duct b.) tearing an end or c.) crinkling where your grip it to stretch it. Besides that, it's a good product.