I toured their factory just a couple months ago and saw numerous models being manufactured first hand by human beings-- not machines!!
I saw Vibrance, Brilliance, Gusto, full size power nozzle, Volt power nozzle, new Pet Vac, and a few other units being produced. I saw got to see a testing room where machines are run 24/7/365 for durability to see how long they last. Also they have a quality check where someone completely disassembles random machines from every line to ensure everything was perfect. If any single thing was wrong with that unit then every machine on that line that gets reviewed again!
Very clean factory, lots of nice people and gorgeous products!! Just like with other machines on the market certain parts like motors may be subcontracted out to another vendor. Think about computers-- the processor and video card is usually Intel or AMD, while the tower is HP, Dell, etc. Think about lawn mowers-- the engine is generally Briggs and Stratton, Koehler, Kawasaki or Honda. But at the same time a manufacturer like John Deere, like Toro or Simplicity or Riccar can go out to engine and motor manufacturers and have that engine/ motor company build a motor to the specs of the product manufacturer. So a certain vacuum motor might be built to certain specs and not just a random motor produced by that company already!
Business can be done in many ways!!
In any regard, it really doesn't matter where a product is produced-- China, Mexico, Germany, USA. That product has to meet requirements and design specifications set by the originating manufacturer. A piece of high quality machinery can be produced just as much in China as it is in the United States. On the same token a piece of crap can be made in the U.S.A just as bad or worse as one that can be made in China. It all comes down to the specifications set by the Research and product development teams of various product manufacturers!