On 22/08/2014 22:26, The Medway Handyman wrote:
The need for efficiency depends on what you are vacuuming. Most places
in Europe have predominately hard floors, which they vacuum. In the UK
we have predominately carpets- which take more suction/airflow to clean.

Whatever the flooring, we want the greatest possible suction for the
least input of electricity. Efficiency, calculated as how much effective
suction is available for a given input, is something we do want, isn't it?

Have to say the approach of using airflow to turn a brush in the
cleaning head has always seemed questionable. I'd have expected an
electrically powered brush would be more efficient,

--
Rod