Iona Fantom's failure was mainly because they lost the rights to James Dyson's dual cyclone technology. When they lost the rights to the dual cyclone technology, Fantom could no longer produce their popular Thunder and Fury uprights and their Lightning canister, which all used the dual cyclone technology. Iona eventually came up with the single cyclone Fantom Wildcat which was an awful machine. Due to the Wildcat's poor build quality and lackluster performance, they were returned in droves, and Fantom went under. Euro-Pro Fantom was most likely axed because Euro-Pro's Shark brand name became extremely popular while the Fantom brand declined in popularity. I guess Euro-Pro decided they didn't need two vacuum brands so they axed the less popular of the two, which was Fantom. It was a good riddance too, as Euro-Pro Fantoms were notoriously awful.