The Rio was amongst the Which? reports. I don't have such a document to hand but I do remember it didn't score that highly. I am not surprised as Which? seem to test and report all products by the same highest standards. Can that really be achieved on bottom of the range products? Of course not. These Rio cleaners did what they said and had a huge consumer base as so many different people wanted them. For instance, new home makers, elderly people, those on small budgets, those in small houses, those in big house (who needed more than one cleaner for different jobs), those who wanted a cleaner for the car. The list went on and on.
The was no cloth bag. The dirt was collected in the main body (dust box) and a cloth filter stuck to a plastic frame was wedged into the rear end of the dust box. They used to clog very quickly so suction was soon lost. It was about the only downside of an otherwise fairly good cleaner.