I love this duo.
For the mandelic: it worked wonders on my acne scars. I have experienced great differences on my face since I started using it.
For the succinic: really good, helps me fight even the most persistent pimples. I have managed to deal with pimples that in other cases would torture me for more than 5 days, only in a day or two. If I have a really persistent one I'll just dab a little more during the day and it works like a charm.