this uniquely designed brush by physicians formula claims to provide the ultimate flaweless and seemless coverage, enhance the blendability of mineral pigments, give a completely uniform and even application of powder, and a visibly soft, smooth, perfectly even complexion with an airbrushed finish. also,
"Flawless Coverage. Airbrushed Finish.
Natural, Non-Cakey Results.
For extra sensitive or breakout-prone skin."

i can vouge for the fact that it does indeed hold its own. for mineral foundation, it's acceptable. i don't recommend it for setting your liquid, because buffing just smears your foundation around, & for sort of pressing, etc., i'd much prefer the elf powder brush. i'm not a huge fan of it for mineral foundation despite it's accurate claims, because it's a little too rough on my skin. i find that it tugs roughly around and that's something i try to avoid in hopes of discouraging premature aging, etc. elf powder brush is way better.
sort of disappointed.
(reviews of the elf powder brush):
http://www.chickadvisor.com/item/elf-powder-brush-1/?page=2#reviews