Between the Tacony brands? Simplicity and top of the line Riccar vacs are made in the US, the rest are made in China. There is a difference in the plastics used between the US and Chinese made machines with US made being stronger and having a better fit. Of course you pay a premium for domestic units. The units with a steel brushroll clean exceptionally well having 4 stiff brush strips but they put a strain on the belts. Thankfully the belts are cheap and easy to change. Being that they have stiff bristles and a floating nozzle they can bounce on CGD but that will go away as the bristles get worn in.What’s the difference in that and all the others?