I have this for some time now and I was able to shape my opinion about it. Now, you can't expect your pimple or acne to disappear over night, because that won't happen. But, in time and by this I mean a couple of days I could see an improvement. The big and red pimples have gotten less inflamed and they didn't last as long as they would if I 'd just let them be and for the rest of them, although they do appear from time to time, they go away sooner and my face, especially my chin area looks less red and less inflamed.
But you have to be consistent with it. It's an everyday thing until your skin looks better. If you don't or can't use it everyday you won't be able to see a difference. This is just my experience with the device.