Wondered about the plastic, but it has good suction. The dual brush attachment doesn't work as well on the brush side as the other, but all-in-all it will do what I wanted quite well.  You have to get it adjusted just right and there's a ring you can slide to let some of the suction off.  That was open when I first fired it up and was disappointed at first, but with that ring covering the hole, it's fine, especially for the price.