Product review (4 stars): Works.
You get what you pay for.  It's a great price, but it's also a little thinner, cheaper made then other ducting I've used in the past.  Regardless, it's adequate for what i need it for and I'd purchase it again if i needed too.  It's also hard to find ducting over 10' to 15' at the local brick and mortar stores.  So at 25 feet you cant go wrong.

I'd give it a 3.5 if I could.