The vac works well, but clogs quickly when cleaning very fine dust (drywall). I am cleaning up after a construction crew that left a huge mess and after about 15 minutes of use, the thermal switch trips, you have to clean out the dust bag, and wait for the motor to cool down before starting again. The cool down period is about 30 minutes. I would give it 5 stars for home use, but for a commercial vac, I am not super impressed. Still a great deal for the price.
The Hoover C2401 Shoulder Vac Pro Backpack Vacuum Cleaner is designed to clean the rooms and hallways of a finished building. It is not designed for heavy cleaning of a construction site. 
WebstaurantStore Customer Solutions