I have been dieting and exercising for about 6 months now and have some stubborn belly fat. I used this for the first time today and set the machine's power to 1 just to see what it feels like. It's completely painless, but I can feel a slight vibration/jiggling under the skin. Make sure you fill the machine up with water (I used distilled water), and find a video online of how to calibrate the machine. Basically, you fill it until water comes out, then push all 3 buttons (+ - and power) at the same time and the machine will blink and push a little water out. That's it, ready to use. The kit comes with a tape measure with a handy metric chart. The machine's envelope is 28mm x 28mm so I drew little dots with a permanent marker every 25mm just to make sure I wasn't missing any spots. I am going to try higher power settings over the course of a couple weeks to see how those feel. I will post before and after pictures in a couple months.
I have not used it yet.