I am three weeks into using the dark spot formula and future formula, too soon to see any dramatic improvement but in general skin feels "bouncier" and brighter. Initially the future formula made my skin slightly flaky (I was prescribed 0.05% tretinoin), the problem went away in a week after I started putting on a moisturizer first. The dark spot formula (I specifically asked for the hydroquinone-free formula since I will be taking anti-malaria drugs, which sometimes can cause ochronosis) tends to pill. I found that I can get around this issue by first applying a moisturizer, then dark spot formula, then wait a few minutes before applying sunscreen. So far, so good. Two cons: there is no phone number to contact Agency and email replies can take days. Also, shipping can be slow.