I am C5 Face&Body, NC42 StudioFixPowder and I bought this after I had purchased the Medium Dark. The MAC MUA had used the Medium Dark to set my C5 Face&Body Foundation and it initially looked good and I bought it. Then I realized it turned orange on me only a few hours later. Not a bad orange, but definitely darker than my natural coloring. I went back and asked for a lighter shade, the MUA said - no way- but against her own advice tried the Medium Plus on me and it was not too light. It turned out to be the perfect shade for me- especially for winter. I have held on to the Medium Dark -for summer I will mix the 2 shades before applying or will eventually just use the Medium Dark when I am tanned. With or without foundation, this powder makes my combination skin look pretty good.