This powder and I have gone through thick and thin together. I have used it pretty much non stop for a year. I love it - it's fresh and light, it doesn't cake up at all, its affordable, it's easily accessible you can find it at The Warehouse and Farmers... It's all I want in a powder!
I typically use it to set my concealer and my T - zone because I get really oily there. However it does not keep me matte all day (maybe around 4-6 hours) but it does a great job of setting my makeup.
The only cons of the product is the packaging. Mine is extremely scratched and battered as the plastic case breaks pretty easily. Apart from that it's really good, I mean who cares about the packaging when the powder is bomb