Product review (3 stars): Didn't know metal came this thin that wasn't on a roll.. but better than the flex hose stuff.
Flimsy material, lots of gaps.  I trimmed off the excess I didn't need and taped every seem with foil duct seal tape.  Dryer works better with this than it did with the hose (noticeable better flow and lower dry times), but I would not recommend using this product as delivered.  Some of the gaps could have been around 1/4" or more.  This would have made a huge mess.  With a little tape and some extra time it works just fine.  Be CAREFUL as the edges are sharp.