In the industry it is said that this was originally developed Dimmerart times for social housing. Of the more expensive models, they differ essentially in that you can not switch the light by pressing the dimmer on and off. The knob can be rotated only, far left is the "Off" position. The dimmer can not "switch" and therefore is not suitable for AC circuits. Whether you can live with it, or wants to pay for the "printed circuit" several times, everyone must decide for themselves.
If you know it differently, this kind of operation, however, is quite used to. Especially in areas where you do not want to turn on the lights suddenly, but rather gently - for example in bedrooms (without changing circuit) - this dimmer but a good compromise with a virtually unbeatable for a brand dimmer value for money.
