This thing works awesome. However, it does require maintenance. After every use I clean all the parts. It is very easy to take apart. If it doesn't suck up debris, either the hose is plugged, the exhaust filter and or foam is plugged, or the canister is full inside - that is assuming the motor is running. If the beater bar/brush doesn't turn and the motor is running - is the belt on? Did it fall off or break? I have read the bad reviews and I can explain it like this if I may: if you want a vac that doesn't require any maintenance, then buy a worthless bag vacuum and just change the bag. However, even those vacuums can plug in the hose or the bag can fill up. The reason the bag-less vacs work so well is, if you keep them clean - hoses clear, canister and filters clean and clear, they move as much air out as they pull in. That's the key - AIR FLOW. That's why bag vacs lose suction so soon, and these don't. Once the inside of the bag gets a thin layer of dust on it, the air flow drops dramatically and so does the suction. Also, if it runs and shuts off and you don't see any dirt movement inside the canister (that's part of why it's clear), like the other person said, something is wrong. If the motor gets too hot, again, due to lack of air flow (air flow cools the motor as well as sucking up debris) and it has internal overload, which mos do, it will shut down until it cools off, then reset itself. Once it resets, it should start again. In closing, let me say this: if you are all thumbs and you don't know which end of the tool you are supposed to use when using tools (like my brother) don't buy one of these vacuums unless someone mechanical can help you take care of it. It is a simple, reliable effective machine. However, it does have one weakness: you have to TAKE CARE OF and MAINTAIN the dang thing!!! That's all I have to say, thank-you.