If You....
....Value your health, safety and sanity, do NOT buy one of these machines. I'm serious.
My late partner had one, purchased new. It quickly developed a habit of wearing through its PN cord where the cord came out of the PN head, because the exit angle of the cord was such that it rubbed the floor during use, and wore through. The first time I discovered the problem, I shortened the cord, figuring he'd done something unusual with the PN and caused the problem himself.
Two months later, he told me the cord was worn through again. I checked, and was absolutely APPALLED - bare wire was showing through this time - there was no good reason there hadn't been a fire. Again, I shortened, cautioned him, and hoped that would fix things.
Well, it kept on happening, and after about the fifth time, there was not enough cord left to shorten it further. That meant a new cord, which is no problem, right? WRONG. The PN cord was a three-wire cord, absolutely proprietary - it was buy it from Hoover or do without.
We did without. There were so many other problems and frustrations with that vac it got broken up before being put in the trash, so that no poor person would find it and be endangered by it.
Don't. Do. It.