Well, yes and no - The wheels on Henry don't forget consist of two castors at the front and the fixed wheels at the back. The combination of castors and wheels allow for great movement as well more precise control of a tub design, don't forget.
The all castor wheel solution is great for hard floors but on carpets even Miele and SEBO vacs with castors ensures stability being a sledge design and thus in turn being able to store cleaning tools, auto rewind cable and a flatter design.
The only reason people are buying the SEBO D series is because of the nearly twice as much cable as the Miele, a fantastic filter system and of course the low running costs of the bag, the high power and the quality. The long hose is a standard feature on the entire range.