Product review (3 stars): Wait a minute, not so fast!
It's expencive and you are only allowed to extend a max of 25ft and every time you add a 90% angle you need to deduct 5 feet from the total length. I had more bends and added the 90% long sweep model LT90 DRYER ELL from In-O-Vate Technologies.  They take up more room but no drag and supposedly no loss on length.  Forget white plastic flex hose they're a fire waiting to happen and the flex metal create drag and clog.  Hope this helps.