I have to say, I too, bought this on a whim. You apply this product at night, so during the day, I kind of forgot about it. After a few days, and forgetting I added this product to my regime, I noticed I was really liking the clarity and brightness to my skin. It took another day or so for me to realize it was the new Pro C serum I added. What's great, is it does EXACTLY what it says it will. Well, I just love it and it is so easy to add, it immediately absorbs into your skin. I do use her pads, then the serum and of course, my favorite hydroshield serum! Considering other serums on the market, this is really reasonably priced....would love it on auto delivery!