The Europeans will be wondering what the hell a DC17 is. It looks like this:
The Dyson DC17 is an upright cleaner launched in October 2006 in the US. Although visually similar to the DC14, it contains new technologies. The first upgrade is the use of Dyson's new Level 3 Root Cyclone. This system incorporates 11 cyclones to more efficiently filter sand and dust particles out of the airstream. In this system, the airflow travels from the low speed outer cyclone to two intermediate cyclones that filter out the bulk of dust and sand particles that are drawn into the system. Beyond that, the airflow flows through the remaining eight high speed cyclones which filters out any remaining dust particles out of the airstream. The Level 3 Root Cyclone improves upon the original Root Cyclone system with its capability to more efficiently separate sand particles from the air flow: contaminants that the current Root Cyclone has difficulty with.
The second change with the DC17 upright is the brushroll design. While the brushrolls used on the DC07, DC14, and DC15 were designed with European carpets in mind, the DC17's brush roll was designed for North America with a cylindrical shape, a large diameter, and short stiff bristles. A separate motor drives the brushroll, unlike the DC07 and DC14 which use clutches that uses power from the main motor.
The third change is a new colour scheme that indicates the colour theme for future Dysons. The bright colours and silver tones are toned down in favour of shiny metallic accents and titanium as the main colour for the entire machine.
While they do share some parts with the DC04, DC07, DC14 and the DC18, much of it is unique to the model; which itself seems to be unique to the US market.