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I did some work with Electrolux when I was at college, where it transpired that the efficiency of a vacuum cleaner isn't determined by the wattage of the motor or whether it is bagged or bagless.
I worked for a couple of vacuum cleaner manufacturers and they used air watts as a measure of performance.
The stainless plate thing is a new one on me but not surprising considering the amount of aero and fluid dynamicists that worked at those places.
eskay
I had a corded Miele which I got for free, which was actually very good.
When the cable retraction mechanism packed up, I replaced the cleaner with a Nilfisk GM80P, which sucks the carpet so hard that it actually takes a bit of effort to push the thing along.
ETA - I did some work with Electrolux when I was at college, where it transpired that the efficiency of a vacuum cleaner isn't determined by the wattage of the motor or whether it is bagged or bagless. What determines the efficiency is affording attention to tiny radii on the grooves on the stainless plate beneath the brush head. Apparently there are only a couple of companies that have done the science behind this and they supply most of the cleaner manufacturers with stainless plates to suit their cleaners.
ETFA - I'm told that a Nilfisk is what they use to clean up once the builders/constructors have finished putting together operating theatres.