I used this product for 3 months and counting starting from around mid January. During this time period I made a mistake and stopped using for some crazy reason. I started to break out slowly and surely...but as soon as I started up with this product my acne cleared right up within one week! I still get the occasional breakout during that time of the month and if I am stressed out, but it clears those up within a couple of days too. My acne scars haven't really improved a ton, but that can easily be fixed later on with a laser. This product greatly improved the skintone and smoothness of my face. I alwyas feel clean and fresh after using this product. I also use it once a day on my chest and back and it has done a good job of clearing up my chest, but not a lot on my back.
The smell of this product is not very pleasant at all, considering it contains sulfur. But after two or so weeks you will not notice it anymore. I use it twice a day and this seems to be the best way for me. After I rinse my face with luke warm water, I apply this, only a small amount, and gently apply it to my face and then rinse off. It can tend to be a bit drying so a mouisturizer is recommended.