I purchased one a few months ago and fell in Love. I usually put it on top of my Foundation to set it in.
I usually cleanse my face, apply light foundation and then use this powder to set my foundation in. You can use the little sponge provided, or use your own brush. I prefer using my own brush. It also comes with a small mirror. The only downfall to this is, the flip up mirror is inside of the package where the sponge is. Besides that I love it. Decent price too. It cost about $14 Canadian . Walmart has it for cheaper.

Pros:
Leaves skin flawless
Does not make it look cakey
Comes with a mirror
Comes with a sponge
Fairly cheap

Cons:
Mirror is inside the packaging