As someone who suffers from adult hormonal acne, this product is outstanding. My skin doesn't repsond well to B.P. (too drying/irritating) or salicylic acid (ineffective) but the sulfur in this seems to do the trick. It really helps bring down the inflammation on red and painful pimples. It won't make them disappear overnight - come on, nothing will! - but it works wonders at shrinking and soothing blemishes.
I find this works best when I catch a pimple just starting to become raised/slightly red. It can seriously knock those out overnight, or in the very least keep them from turning into something bigger. I've even used a very thin layer of this over a large area (basically, my entire chin) and it has never caused irritation.
Only a couple drawbacks here - it doesn't perform great under makeup, so I use it mostly at night. Also, the product kind of squirts out of the tube if you aren't careful. Can be wasteful for something expensive. I will absolutely 100% continue to repurchase this though and would definitely recommend it.