My first dealings with a Singer/Kenmore twin fan was about 10 years ago. I'd come home on vacation to my moms and she had one in the linen closet. So I set to vacuuming her livingroom which is carpeted in a very thick plush. It was like pushing a brick across the carpet at every setting including the shag one. I fiddled with it, checked it out, nothing, everything was as it should be but it just couldn't be adjusted to smoothly roll across thick plush. Oh and the noise. So I ran out and bought her a Panasonic Jet Flo, what a difference, she still uses it. They work fine on less than plush carpeting actually they work very well, very aggressive.