Powerplus popularity
I have to say, I don't remember this cleaner being at all popular in the UK. AFAIK, there were two reasons for this.
Firstly, the Powerplus was introduced at around the same time as the Turbopower (US Sovereign) range. Hoover really pushed the Turbos hard - they were normally at the front of brochures, with pages detailing why they were so great. The Powerplus was invariably hidden towards the back. I've known quite a few people who owned a Turbopower, but no-one that had a Powerplus.
Secondly, I understand from other collectors that the Powerplus hads several design shortcomings. The handle was way too weedy for such a bulky machine, and the handgrip used to snap off - and I believe the metal poles would bend and break too. Also, as the cleaner had a combined handle and power pedal, if the cleaner was switched on with the tools attached the handle would fall backwards and wallop whatever was behind it, unless you remembered to hold on to it when you pressed the pedal. Lastly, it suffered the rather inelegant habit of blowing its paper bags clean off the fill tube, especially when it was being used with the tools and the motor was running at the higher speed, although Hoover later came up with a modification to prevent this.
They seem very rare now, especially the Dust Cup version. I've only ever seen one, for sale in a second hand shop, but didn't buy it as it was a bit modern for me. Wish I had now, of course.
Si