I use BP like some people describe they use their MSF. All over face, as a blush or just to give life to some part of my face or neck. With my skin color it gives more life to it and I can use it as a blush too. You have to try them tho. Why ? well, some people says BP (like Alpha Girl) don't even show on them, for me, I can literally look like a hooker with it if I want. It's a really fine powder that you can layer a lot depending on the shade you want. The shimmers in them (when there is) is really subtle and nice.
I love them, maybe because I'm less in shiny-shimmer face then some are. So: it's a mater of skin tone and personal taste.