This stuff should be called a miracle in a bottle. When I use it on my (pretty dry) skin, it transforms it from congested, irritated, and bright red to calm, clear, and glowing overnight.
Most of the people reviewing this are using it incorrectly. It's an acid exfoliator. That means you should use it once a week, twice at the most (if your skin is oily and needs a lot of work.) It is not supposed to soak into your skin. You should keep feeling that greasy sensation until you wash it off. Also, it should never be used during the daytime. BHA, or salicylic acid, interacts terribly with the sun. If you absolutely must put it on in the morning, follow it up with heavy SPF, but I wouldn't do it.
This stuff is like anything else- it only works if you know how to do it properly.