Well Tolivac, whatever thoughts you may well have regarding Vax bagless uprights, they all came from ANOTHER brand. Before TTI took over Dirt Devil U.S, that's where most of Vax's bagless uprights came from.
The Bosch merged Vax AVC, later known as VX-1 and other model names was a high end premium upright vac. As Beko rightly notes, Vax were taken over by TTI as soon as they got their hands on Dirt Devil U.S and ever since then, all bagless Vax models have been on sale worldwide as Dirt Devil or Hoover products, with cosmetic differences. The only exception has been the original Vax canister, also sold in the U.S under the Dirt Devil Wizzard.
Its a pity TTI don't go far enough to rebrand the bagged uprights though, much to my annoyance.
Bissell and Samsung also have a merger going on; most of their bagless uprights are also made from Samsung parts.