Vacuum Wars! He tests, reviews, and compares vacuum cleaners. And he’s very thorough and scientific. His standard, but not only test is to measure sand by mass, put it in a carpet, run the vacuum in question over it, and weigh the remainder. That gives him a benchmark for all of the. He also does electric mops, carpet cleaners, air filters, robotic vacuums etc. If you are ever in the market for a new vacuum cleaner, check it out!