Dyson is known for its ads about its vacuum cleaners that don't lose suction. Now in its most significant generational change since the introduction of the Dual Cyclone, the British appliance maker has increased the maneuverability of the upright by employing a bright yellow ball beneath the machine, instead of the conventional wheels of most uprights. The DC15 model, dubbed "The Ball," navigates more freely around furniture and reaches places a traditional vacuum does not, such as beneath cabinets and beds.