I've been using this for the past week and a half now and it's really helped to lighten up my post-acne marks.  Most of the marks are almost completely faded and hard to notice, which is amazing especially in such a short time frame!  I'm so happy that it's worked this quickly.  This essence is very cost effective too, I only use one pump and it's enough to cover my entire face.  It goes on light and absorbs after a few seconds for me.  I haven't noticed any sticky residue unlike some people, so that's a definite plus.  It also moisturizes pretty well, but it's not really a stand-alone moisturizer.  I really love this essence and I definitely plan to get it again once I run out.