I actually bought this to be a powder brush, but I think the bristles are a little too sturdy and don't have a lot of give, so the powder is accentually just sits in blobs on my face. However actually using this brush for its main purpose - buffing in liquid foundation - a complete dream.
I use this by first essentially 'painting' my foundation on in nice lovely stripes across my face. Then I use this to work that foundation into my face, therefore leaving me with a nice, flawless base. I think this works best with light, runny foundations. Dare I say it, sometimes I prefer this to my Sigma F80. It's not as dense, easier to wash and cheaper. Bonus.
What's your favourite foundation brush?