A powerful wired one is difficult to replace, but the absence of wires is a convincing argument. Its pros: * without wires! * beautiful, expensive appearance * it is rather convenient in work, the weight practically does not interfere * the brush itself drives, just guide * ease of garbage disposal * washable filters * a sufficiently capacious battery, at an average speed one charge is enough for an apartment under 100 sq. M * additional turbo brush for soft surfaces * wall mount with space for additional brushes * beautiful high resolution color display * electronic keypress function Cons: * the minimum speed is meaningless, the maximum is a hell of a howl and a very fast battery drain * the need for dreary cleaning of three guide rollers from wound hair / wool after each cleaning * no normal carpet brush (standard only picks up surface debris)