Does a good job of dropping sawdust out of the vacuum hose before it hits the shop vac, making the filter last longer. I vacuum a lot of dust which quickly clogs the filter otherwise. Note that this makes the unit more cumbersome. The lid stays on if the vac is on, easily falls off the standard five gallon bucket otherwise. I am going to add some bungee ties to keep the lid on the vacuum is off. The price is excellent, delivery speed excellent as well. I recommend if you have space and the need.