We are looking for carpet for our upstairs so have visited with installer/ carpet cleaners etc. It seems that some Dyson models as well as other brands untwist the carpet fibers therefore wear out the carpet very rapidly. I would suggest that before making a purchase decision one should do some research as to what is best for carpet. It is too big of an investment to just go to WalMart or Costco or whatever and read the box only. IMHO.