I have been using it and found that it works well. It has a nice silky feel and I mixed it with my moisturiser and then apply. I have found that it can leave small, fine particles if rubned to hard. I wonder if that is the reflection of my skin however - I have skin that needs a lot of exfoliating. I find that I have lots of blocked pores (lovely).
I am skin type IV and have no issues with ashiness.
I don't usually reapply but when I do there is no issue with build up or a "ghost" effect.. I use Jane Ireland powder sunblock for the rest of the day.
I hope that helps.
P.S I personally have recently started to avoid moisturisers after electrolysis for a couple of days and use aloe vera gel and argan oil mixed so there is no possibility of reaction such as whiteheads for the ingredients of my moisturiser. Still get one or two for a day.