Before I usually used Estee Lauder Night repair but I bought Secret Key and I compared them... I used one day one and another day the other one and I saw that the results with SK was better. I did the same but 3 days one and 3 days the other one and also SK was better. But you don't need to do that with the first time you use it you can see the results my skyn improved the first night all the troubles spots red zones.. disappeared or were very very very small! I use it every night I can't go to sleep if I don't use it.