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Y225 Marble (was 117 in the original formula) is a good match if MAC's foundations in NC15 are still a bit too dark for you, this shade is a tad lighter than NC15.
Y315 Sand (was 125 in the original formula) is similar to NC30, although the undertones are a bit more beige than a typical NC shade (less yellow).
Y415 Almond (was 128 in the original formula) is a good match for a N40, it's a neutral shade with beige undertones. It's the perfect shade for me when I'm very tan and I like to mix it with Y315 when I need a darker shade. I already had this shade in the old formula and it's the same color, for those of you who are wondering.
This will be an awesome foundation to have in your makeup kit if you are a makeup artist because it can work for pretty much all skin types and it looks really good on camera. The semi-matte finish and silky (yet not greasy) formula allows you to use a mattifying or illuminating primer depending on the skin type and the desired finish.
Compared to the original HD foundation, this new formula gives a bit more coverage and the texture is less oily, more silky. It provides medium but buildable coverage and the finish isn't luminous or dewy on me, it's semi-matte. Honestly, I don't see a big difference between both formulas but I do prefer this one for my oily skin. It doesn't keep my skin matte all day and I still recommend to set it with some loose powder, but it's not supposed to be a mattifying foundation anyway.
My skin is very oily so I've experimented with a few different mattifying primers. I didn't like the results with Make Up For Ever's Step 1 Mattifying Primer and NeoStrata's Oil Free Matifying Fluid, it looked a bit cakey. However, this foundation works great with Becca's Ever-Matte Poreless Priming Perfector, Make Up For Ever's Step 1 Smoothing Primer and Illamasqua's Matte Veil!
I've tested this foundation with different methods too and while I had great results with my fingers, I did prefer to apply it with a damp Beautyblender!
The Make Up For Ever Ultra HD Invisible Cover Foundation retail for $50 CAD for 30ml.
(I received this product in order to evaluate it and give my opinion, but rest assured that my comments are always honest and impartial.)