Product review (4 stars): Create product in clever hands.
4 starts: the vent is very sensitive to bending and squeezing.

The product is great: it has smooth inner surface, is robust and vert lightweight. Fittings that are shipped with the tube being installed (screwed on) make a perfect sealed connection and prevent divulsion of thin aluminium foil. They also support hosing from twisting after connection. Being extended it will stay that way and will not fall back or make U shape slacking. It even can hold weight of it's own and attached adapter.

The hosing itself us made from corrugated aluminum foil strip that bent in spiral and connected together by means of V shaped lock. That part of the product is most sensitive and vulnerable. One has to be very careful when extending the hosing and bending it. If you need to make a turn - better not to squeeze it and that what makes it difficult some times. It also has a limit of approximately 100 degrees so to make a U turn (180) one will need significant length. I would say that one could only make 1 U.