Zorb
In the UK because people often spend a lot of money buying and installing their fitted carpets, yet a good deal of them wouldn't think to get in a professional to deep-clean them when they are dirty. Right from the days when Hoover began making a shampoo-polisher machine (and probably before that with the Bex-Bissell shampooo applicators) people in the UK have loved the idea of 'having a go' at carpet cleaning.
In so many cases, it is quickly identified that carpet cleaning is so much harder than first thought, and the results (in particular the re-soiling of "clean" carpets) are very poor. I would consider that the sale of domestic carpet cleaning equipment was always steady up until Vax really took off in the early parts of the 1980's. Once the practicalities and novelty of Vax 3-in-1 began to wear off, UK consumers seemed to go a little quiet on the carpet cleaning front. Dyson offered a dry-powder cleaning system to supplement their new upright cleaners, and 3-in-1 cleaners were still available from two or three manufacturers, but the desire to clean carpets had pretty much disappeared.
I don't recall the DC04 Zorbster being a huge success in the UK. It was expensive and cumbersome with the hopper attached. There was a DC05 version of it too, the motorhead, which didn't distribute the powder (the user had to do that) but it did have the option to brush the powder into the carpet without the suction motor running.
Dyson make all sorts of claims about their Zorb powder, as do manufacturers of cleaning products such as Vanish. Wet cleaning is also very fashionable once again, with a whole range of upright extraction cleaners on sale from many manufacturers. I still maintain that carpets are best cleaned by people who know what they are doing.