I have using this ampoule for a week now and I can say this is very gentle calming ampoule for my skin. I started with 2 bumps on my forehead and redness on my cheeks and now they're gone, even so, it took very slow on my skin to give visible result for the bump, but for the redness it works almost immediately. Although the main concentrate is tea tree leaf extract, it doesn't dry out my skin; instead it hydrates my skin very well—so well that I think it's more suitable for night routine for most effective result. I did try to use it for day routine, still fine but a bit heavy as I feel it has oil element in it, too.
I think it's more about my personal preference as I don't feel comfortable using it during the day, it somehow makes my face a bit dull and greasy (without makeup and such)—although with matte sunscreen it works just fine.