I have shade #11, and I am currently using it in conjunction with Sappho’s liquid foundation. I use it mostly to conceal under my eyes and and any other blemished areas. I also apply it sparingly to my eyelids prior to sealing it with a translucent powder which provides a good base to apply eyeshadow.
Initially you might think it is a bit expensive for a concealer (approx. $39.00 a jar), but in my opinion it is worth it, considering the ingredients and performance. Since it can be used sparingly and still cover well without needing to reapply during the day, it will likely last quite a few months. Not only that, but it’s not a bad price to pay for the peace of mind of concealing skin problems with something that could potentially heal, as opposed to further aggravate any irritation.