Roller shutters are useful in many ways and increase the comfort of the end user considerably. Shutters provide thermally as well as acoustically extra insulation. In summer they keep the sun and heat out, whereas in winter they make sure the warmth stays inside. Street and environmental noise is also perceptibly lower.
In addition, roller shutters offer an increased sense of safety as they extend the time to break into a house. They also offer more privacy and rooms can be darkened, ideal for late risers and for those who want to darken their rooms during the day.