I purchased the ELF powder brush a while ago and I have been using it ever since. It is a fantastic brush and I would completely recommend it.

I use it to apply powder (duh :)) over my foundation to set my foundation. (The powder I use is not a loose powder, by the way) The bristles are very soft and, like on some other brushes, no powder falls off and makes a mess.
The best thing is that it is very cheap. It costs only US$3. :)
Katarinaxoxo