Filters are a running cost. Replacement brush rolls, If you can even buy one, are a running cost. The labor to clean them regularly is a cost too, a time cost. And the durability of something like a Sebo, Lindhaus or Aerus product means you are not forking out for a new vacuum for decades. That is money saved, a lot of money too because Diesoons are not inexpensive to buy. Pay $800 up front for a Sebo G5 and never have to buy another vacuum for a few decades. A package of Sebo dust bags that will last you a year or more costs less than replacing the filters on a Diesoon. Brush rolls are cheaper too, and more durable. Same story for Lindhaus and Aerus. Long term they are cheaper to own and less frustration overall. But oh dear they are not trendy. Who cares about trendy? Trendy doesn't clean my home.