Product review (1 stars): Please read this review.
The unit is made of plastic and is very flimsy as well as very light weight. The suction cups slid, so I had to hold it by the bottom brace to keep the unit from sliding everywhere. Banged my knuckles at first which really hurt. The instructions aren't good. Just some drawings but no explanation at all.
As far as washing is concerned, I put in one pound of clothes for an easy light weight test. I used one quart of water which was immediately soaked up by the clothes leaving no extra water in the unit to slosh around with the clothes during washing. I had to add much more water than was instructed. I put in one tablespoon of detergent and turned the unit around for more than three times suggested amount of time. Also, after a few times going around, the clothes would stick to the side of the unit so that they wouldn't flop around inside which would create friction and movement. I had to slow way down so that the clothes would again move around. I couldn't return this fast enough.