I have fair skin, dark circles and fine lines under my eyes. I use the Powderflage to set the concealer (it is not a concealer to use on its own).
This is how I use it: I first use my Aveeno Active Naturals Positively Ageless Lifting & Firming Eye Cream, then with a SS194 or a SS224 Sigma brush I apply the Clinique line smoothing concealer (number 03), and finally with the SS224 Sigma brush I lightly brush the Powderflage under my eyes.
The Powderflage really sets the concelaer, it's a loose highlight powder, and difuses the fine lines under my eyes.
The size is ok, it is small, but I only use a little amount of it, and I'm sure it will last a long time. To use only a small amount of product, I didn't peel off the sticker that seals the powder in the container, I made a few holes in it, and this prevents the waste of product too.
I don't use the "flager" brush, I use my Sigma ones, but I kept it to include it in my makeup travel kit (small size brushes).