Personally would recommend this product for those stubborn dark spots! I have tried and they're quite effective if you follow through the treatment.
A very expensive treatment. But after using for about 4 nights, I see that my lighter spots is starting to fade.
My package with my regular facial did not really help my dark spots fully. It did lighten, but it did not completely get rid. Thought I should tried this, since its cheaper than my facial package. I'm currently close to halfway of using this, and my dark spots have continued to lighten slightly. Seriously hoping by the time I finish this treatment, the dark spots will disappear!