let me add my two cents here...
coming from somebody who is very critical of cleaner quality and performance, i'd like to add that, IMO, the Concept/Powermax deserves to stand beside Hoover's 60-series and Convertible-series models as the best ever made. the Concept looks plastic on the outside, but is a very serious cleaner on the inside. i find almost no evidence of skimping or cost-cutting on Hoover's part in the manufacture of these models. quality and performance were obviously priorities with this design <br
i had a four-amp model of Concept One, and even at this (relatively) low amperage, this machine was a powerhouse cleaner <br
btw, from what ive seen in the old adverts (i was a small child when the machine was popular) the Concept was not an inexpensive machine. even the BOL model was close to two-hundred bucks, wasnt it?