The e.l.f. (eyes lips face) products has been my favorite since I got the mineral eyeshadow primer. It's a great primer and helps eyeshadow really stays on all day. So I tried the brush.
All of the studio line brushes are synthetic, which means you can use it with powder or cream products. The first one I got is the powder brush as shown below.
It is that good.
These two brushes that I got was priced $3 each, and about Rp50,000 in Indonesia, because of the shipping cost. It's still very cheap. In comparison, you can only get 2-3 MAC brushes for the whole set of e.l.f studio brushes. So no more unreasonably expensive brushes if you can get (a lot) cheaper one carrying the same quality.
That being said, I'm now eyeing the whole range of e.l.f. studio brushes. To see the full collection details, go to http://www.eyeslipsface.com/studio/brushes