i have had a ShopVac 4 gallon unit for a few years. Works fine for what it is used for (cleaning auto interiors). The only issues I have ever had are the top motor bearing dried out and got a little load. Easy fix after all the screws and clips are removed. Second issue related to first - i did not replace the spring retainer/press fitting that holds the impeller wheel when oiling bearing. Turned out to be big mistake - keeper came off at speed and impeller cut through the plastic housing. Repaired that will epoxy as parts for my model no longer available - lots of work for trying to reuse a 49 cent part!