The short answer: It's hard for me to make myself use any other blush or cheek highlight. It doesn't matter if I'm pale or sporting the sunless tan.
One thing I have noticed, however, is that when I try putting PosieTint over my mineral makeup, it sticks to it right away, so I was walking around with a pink circle on each cheek (not completely noticeable because I saw it and tried to blend the heck out of it without redoing my makeup). They work best on bare skin or over liquid foundation.
Anyway, still lovin' them both. :)