Pros: this little compact got me through several humid, Florida weddings without giving me dreaded ghost-face in the photos. I apply this powder over my SPF moisturizer or Laura Mercier loose powder. I prefer to use a stipple brush to dust on initially in the morning, and then use the enclosed sponge for any touch ups. You will want to use a light touch when applying or you will have a tough time blending. The result is matte with a blurring of imperfections. I also use it on my eyelids and under my lower lash line to act as an oil-absorber to prevent eye liner smudges.
Cons: it's not 12-hour matteifying by any means. I typically have to touch up in the afternoon, and again at night if I'm heading out.