Exactly. Cyclone should be tested for what they do- separate various sizes of particles at a cost of pressure drop. Impellers should be compared so the design advantages and disadvantages could be shared and trade offs made for each application. Filters, cartridges and bags could be compared for area needed and pressure drop as well as filtration. Motors could be discussed so I could learn what makes a good one- and DC need good motors. There could also be tests done to quantify what size dust is created when woodworking. Manufacturers design for large particles and woodworkers worry about submicron stuff. Identifying the problem is usually the first step. Seems like most of the technical info is from specific industries, woodworking not being one of them. Seems like magazines are trying to stay simple rather than pulling to reader up to a higher level. Maybe it is what makes us all happy. Dave