Oh dear Carmine, please dont be fooled that just because something that sells in droves is necessarily better. Let me think of one of the world's smallest cars in the States in the late 1980s that sold well but wasn't really that good. Infact the U.S market became the biggest country who bought into the NASTY YUGO salesdrive until it all went pear shaped. Another example.. well one could argue early model Dysons... The SS in the UK does have some compeitition from other Chinese made offerings, particularly a triangular copy. The difference with the Shark one shown on here (incidentally that sells under the GTECH label here who are known Chinese operative co-independent manufacturers) is that it doesn't have uniform 360 degree brushes corner to corner. The Shark may well have a hand design handy for stair cleaning but it can't be swivelled around like an SS. We have another GTECH model with a duster attached and other models with higher battery power.
No misunderstanding/misconceptions on my part about product popularity versus performance. Just an observation. I recall too well the Regina Electrik broom. A drug on the market that sold very well for years and years. Then, too I know the Royal/Dirt Devil handcleaners sell millions upon millions and performance is praiseworthy.
Carmine D.