I have been using this product for a couple of weeks in conjunction with Susan Taylor's RX serum, and I'm pleased with the effect they seem to be having on the hyperpigmentation on my face. The spots, from old pimples, are noticeably lighter and easier to cover, and I'm hoping they will go away completely. The product is gentle but powerful and doesn't have a caustic smell (unlike some older lighteners that contain hydroquinone). I'd like it even more if it were cheaper.