as much as I like kirbys-I have many in my collection-I have 3 Model "M"s in my collection as well-Yes the NSS units are direct air-and yes VERY powerful-more so than any Kirby model.The NSS does most of its work by VERY high airflow-not really "suction" pressure.Its VERY large 8' fan is turned aboput 10,000 RPM by the high torque slower turning motor-and becasue its slower-bearings and brushes last longer-that is why NSS claims brush life on these machines to be over 2,500 hrs as opposed to 500 hrs on other vacuums.Yes we can say the NSS vacuum is much like the Kirby set up with its hose-the main diffrence is the scrap trap in the NSS.I wouldn't want to think about using my Kirbys to clean up some of the jobs I have used the NSS m achines on.In vacuuming out broadcast transmitters and similar equipment it is not unusual to pick up hardware such as nuts,bolts,screws and LOTS if fine dust.When the job is really dusty-and lots of it-I go for the NSS.You can also use a powernozzle on the "pig" like a giant powernozzle canister-but I feel the kirby is better for that task of cleaning carpets.For surface dirt-the non powered carpet tool on the NSS works well.I have bare floor tools foer mine and its great if you have LOTS of hard floor to vacuum.For its size-the NSS bare floor tools are very easy to push-and the pig follows you well with a gentle tug on the hose.Sometimes the hose may come off-you have to make sure the hose connector thumbscrew on the Pig is tight.the sound of the NSS pig is sort of like the kirby-a softer lower note sound.