I've used the Opal twice a day for 10 days now and am amazed at the results. I am prone to under-eye dark circles and wrinkles - have had no other success with any other product like this. I am using the Opal along with the Clairsonic facial cleansing brush. Terrific! While pricey, it's definately worth the investment. My only negative comment could be that the replacement heads are not available at more stores. My Sephora in JC Penney is too small a store to stock them, and as of today Ulta has never heard of this item. For now I will order online from Clairsonic.