My experience with this product was bad in mang ways. The initial one is the smell of the serum. Though it was not fragranced which I can appreciate, the natural smell was very yeast/ vinegar-like and I was unable to get used to it. The other thing is how it made my skin feel. To preface, I want to mention my skin is pretty resilient, however the times when it does not like a product it makes it very evident. I began using it in the PM and trying it once a week as directed for sensitive skin just to be on the safe side and as the packaging suggested. Though it did brighten my skin, I also noticed my skin did not look or feel good in other ways, and it made my skin a bit puffy or swollen in appearance and the texture was a eneven feeling which was not ideal. I tried to let my skin get used to it trying it for a few weeks in a row to no avail. I gave it a rating of 3/5 because it did technically do what it was supposed to do, the negatives for me just outweighed the positives. If you do not get the occasional reaction to a product or are not bothered by the scent then I think you would have a positive experience with this product.
