I have it, but have never got it to work. The whites are very warm, bordering on cream, which wasn't what I wanted
I use the black and flesh sets a lot, starting with the base, shading then highlighting.
The paints have decent coverage, although the flesh base takes two thin layers. With the white I may be tempted to start with the shadow colour and work up, rather than starting with the base.
Some of the differences between colours can be quite small. With the black I use every other colour, while with the flesh the difference is so large I have to mix to get an intermediate step.
Good luck with whatever approach you take