That depends. In California where I live a lot of these modern plastic brush rolls either warp, making the vacuum or the power nozzle shake like an old Harley Davidson, or melt from overheating if they are used more than an hour on American style carpets. Even with the AC blasting. And it is not just Dyson or Shark having this problem but Miele ( $95 for the OEM Miele SEB236 brush roll and you can kill it in an hour of hard use ) and several other brands with plastic brush rolls experience this same failure. If you look at vacuums sold in the US for commercial use their brush rolls are generally made from wood or are steel with bristle strips inserted into slots in the brush roll. Steel bearings and steel end caps too. That is what it takes to hold up on American carpets in American homes where you will often need to run the vacuum a couple of hours straight to do your cleaning. In our own home a quick clean, just the main living areas, but no bedrooms takes an hour and a half. Throw in the bedrooms and you are talking half a day just vacuuming floors.