Product review (5 stars): Hardware Improved Since Older Reviews!
Much quicker & easier to use than I expected! I highly recommend it. The manual is very simple and includes good/helpful pictures. The instructions give you many options like if you use it from inside-out or outside-in, suck with a vacuum or blow with the dryer itself or blow with electric leaf blower.

Some (old!) reviews complained of fragile plastic connections. What I received has all metal connections that are heavier duty than I expected.
There was no instructional DVD included but you don't really need it. The web-site promotional video shows how easy it is to use; believe it. I was put-off by the "house fires" scare tactics. That's the only thing that cheapened the experience for me.

I ran it from the outside-in using the dryer to blow the junk back out toward me. I had to fight the urge to drill in too quickly. Just push in slowly and it'll give you what you want. I used a Makita cordless drill and it worked fine. I bought the extension kit; turns out I only needed 1 more section. I went through a couple of 45 degree turns and didn't even feel it.

Before I bought I thought the main cleaning brush looked little small in the pictures, front to back (not around) but I was wrong, they know what they are doing. It comes with many accessories so you can deal with whatever surprises your vents may present (total clog, birds next, etc.). I particularly like the attachment that blocks you from shoving the brush too far. Excellent safety feature. I misjudged the distance and hit the block. It prevented me from harming my foil tubing.

Don't let the low Amazon price fool you, it is well made and worth more than they charge. I have friends lined up to borrow it. That says the kit is sturdy enough that I'm not worried about friends breaking it or wearing it out.

BTW, this review took longer to write than cleaning 14' of vent from the outside.