After the first ten-minute facial use (3MHz thickness 6) with preservative-free Ultrasound (! I'm not allergic) I was shocked when looking in the mirror: under the eyes massive swelling bulged veins and correct eye bags, which I had not before. All this has completely regressed after more than a week. I've then also at this leave an application and sent the device back. I run for almost 20 years successfully developed a natural medicine and can from my experience saying with numerous patients, no one is like another, and accordingly no skin as the other, so that there can be no device that is suitable for everyone. A doctor friend then also confirmed my suspicion that the tight junctions (cell contacts) may be overstretched by ultrasound, which caused swelling; This is because the skin under the eyes is particularly thin and especially sensitive. But there arise not only swelling, it becomes sagging skin exacerbated. Of course I have taken up with the manufacturer contact which was very helpful and anxious. However, it did not explain the. Possibly I've used too little Ultrasound and / or the transducer pressed too hard onto the skin (application recommendations are missing from the manual, this would certainly be very helpful). Anyway, everyone has to make the experience individually, whether this device or another technique works with him. The proud price of 249 Euro is probably attributable to the fact that the device offers two transducers of different intensity for face and body. Whether that makes sense, everyone has to decide according to their requirements. I wanted to use the device only for my face, but it's just too expensive. The device is also very heavy in the hand and is ergonomically shaped. A central rejuvenation would facilitate handling. Because of the constant contact between the contact surface (s) the hand is paralyzed.