here be the deal , this be a table saw . it make sawdust . the hole on the back by the power cord be a sawdust exhaust port . if you have a dust collector , by all means plug a vacuum hose into that port and it may even collect all the dust . I do not have a dust collector , this mean the exhaust port throw sawdust a good 7 foot or so out the back of the saw . add this collector bag now mean I only have to sweep up directly under the saw , not under the saw and a arc 7 foot out away from the saw . to I it be absolutely worth it , but it will not replace a several hundred or thousand dollar dust collection system .