It works well after some time. Easy to apply.Shipping is usually fast. Has sped up healing and reduced oiliness in prone areas. I would like to add: Dan's cleanser is very good; almost no irritations, and leaves a moist feel to the skin after use. Nodules have reduced down to maybe one every three weeks and most are small and heal quickly.That is a tremendous improvement over one nodule every week. Some irritation-- stinging, dryness, aged skin-like effects around eye areas. Using jojoba oil and cocoa butter around these age-effected areas. May continue to purge for some weeks before it begins to reduce the severity.Some nodules are stubborn or resistant. I was reluctant to use any sort of benzoyl peroxide product at first because I used it for years off and on, and it never really was effective. I am glad I gave this a shot now. Both the treatment and cleanser products have worked with persistent use. I stayed close to the recommendations Dan set forth. And I must say, after some purging and cycling, I am 90 percent clear as long as my stress levels stay down. I had suffered with nodular acne when I was young and it reoccurred 12 years after accutane was successful, followed by a topical antibiotic which failed after 12 yrs. I am now 48 yrs young-- ha ha, and have what my derm calls chronic, incalcitrant acne. So I definitely have come to realize that there is much hope for this kind of treatment product. The low concentration with heavy application reduces the adverse effects fairly well, but works to control the acne overgrowth. That seems to be the case. I wish I had tried this many years ago. My thanks to you Dan Kern.