Vacuum cleaners are a cornerstone of maintaining a clean home, and so it's worth spending money on a decent model. Two of the most well-known names in the high-end price bracket are Dyson and Kirby, and both offer powerful suction. However, that's pretty much where the similarities end.
Kirby is a very traditional brand of vacuum cleaner, and hasn't fundamentally changed its designs in decades. In contrast, Dyson is all about harnessing technology to make its vacuums smaller, lighter and easier to maneuver.
