I had use Refa before and first time try out on Ebisu. The result is obviou after the first use. I saw noticable smoothness on my skin the morning after I used it for the first time. I also used it with my other serum, and it seems working fine. The only down side is that it has no sounds or vibration while working. Its hard to tell if it is working or not. I have to check on the display to see if it is on the right selection. Other than this, everything seems fine. Easy to use, easy to handle, not heavy, and easy to clean. Five stars that is. Will recommand this to my friends.