I-Vac is a robust well designed and user friendly machine. It has a high/low function, perfect for day time cleaning. The low power setting is ideal where lower a noise level is required The vacuum has an automatic close system for the filter bag and even whistles when the bag is full. The vacuum also whistles when there is a blockage. The c06 also has a clever valve which opens when the machine has a full bag or is blocked this lets cool air in to cool down the motor to avoid the motor overheating.