usually my face gets very oily and shiny a few hours after I apply either powder or liquid foundation. I opted to try Laura Mercier's Shine Control Setting Powder because I wanted something that would help control my oil and mattify my face.
after using it, i've noticed a big difference. my face is not as shiny and oily during the day after one or two brush strokes of the product.
also, i use a brush instead of the sponge it comes with, but i like that the packaging allows you to carry it around with you.
overall, i really like the setting powder.