I’ve been using the ZKS31 Dimmer for a few days know and I am impressed. It is the first Z-Wave Dimmer I’ve seen with a physical knob. You can turn the knob to dim and you can push the knob down to turn on and off. You can also use the up, down, left and right buttons to turn the lights on and off as well but I just use them to report scene commands. The dimming is very smooth. I bought the item directly from the manufacturer then got it 10 days later from China.