if it beats,you wont beat it
In 1974,Consumer's Research(not reports) put out their vac tests and said "at first,the Electrolux shag rug rake appeared to be a good idea.But the Electrolux power nozzle removed FAR more dirt out of our test carpets".Another interesting note in that article mentioned three types of vacuum cleaning methods.First,the straight suction,or suction only nozzle such as the Sunbeam nozzle they had pictured.Then,the Electrolux 1205's all-brush power nozzle,with a "smooth brushing action".They said this was not as "energetic" as the Eureka power nozzle.Here,the usual brush and 180 degree opposite beater bar in its nozzle exerted a postive beating and sweeping action.