Product review (2 stars): ok. Good idea, but didn't work for me
The tubes bend/crimp too easily. Also, the 90 deg piece is not very small.
I ordered the dryer side of the low clearance style duct from Builders Best (like the wall side comes in this kit). I learned you should only use (1) of the low clearance style per installation.  This kit is a bit decieving because it isn't complete. If you didn't have both sides low clearance, then you would still need another 90 deg, plus a tube to go between the (2) tubes (top portion that is not near the ducts on the wall and the dryer at the lower level).