The Amway vacuums were NOT better than the Fantom cleaners. Fantom Thunder vacuums incorporated many things that had been invented by Mr. Dyson AFTER Amway stole his design. Remember, Amway stole the design of the dual cyclonic cleaner (the Cyclon) from Mr. Dyson in 1985. When Amway went to Bissell to ask them to copy the machine, and make it for the American market, the shroud had not been invented yet. This is why the Amway lets hair and fluff into the high efficiency cyclone, which lands on the pre-motor filter. The Amway did not have the instant change-over valve, nor did it have any type of post motor filtration (certainly would never have HEPA filtration). If you take the 1984 Cyclon, and give it steroids, while removing the floating nozzle and instant-change over valve, you'd have an Amway.
ACCURATE history is important. If you really want to know exactly what scam artists Amway is, read Mr. Dyson's autobiography "Against The Odds". He devotes an entire chapter to detailing what snakes Amway executives are and how they stole his design and patents.