I never write reviews for skin products but this one made me share my thoughts...
Been using this product for over 2 weeks. I did see the result almost overnight but it also dried my skin horribly (!) and it peeled several times (Warning, gore: sometimes I could peel the skin with the contents of the spots, I know, ewww!).
I stuck with it mainly because after each peel it reduced the amount of spots, I just had to keep it moisturised ALL THE TIME (I used L'occitane essence sublime and some other L'occitane cream, but I think there are plenty of other alternatives).
Currently my skin looks so much better, it's unbelievable.
I did have a moderately severe acne and I am currently happy to actually see the skin that has been behind all those spots... (including a heart shaped scar that they left me!)
I should mention that I have also been taking Perfectil plus Skin vitamins for 1.5 months now and been on a veggie diet as this could have had some impact...
I used it morning and evening (kept adding L'occitane throughout the day), most of the time under the foundation (in my case Estee Lauder Double Wear Stay-in Place Makeup)
Overall very happy so far, hope it stays like this.