I absolutely love this product, especially when I am going out. It is very highly pigmented, so the tiniest bit on my fingers can rouge both cheeks perfectly for a night out, with a little left over for my lips. I use it as a base to put my red lipstick on for a night out in case the lippy fades.
For daily use, I put this on before I put on my powder foundation, or if I'm using cream, while I'm putting foundation on my cheeks. But it works best when I put it on the night before and let it fade over the night into the perfect subtle hint of colour.