I mostly use this for applying concealer under my eyes, as I found that it spread the product too far when I used it to cover blemishes. It's not the best at blending the concealer (elf's Blending Brush does a better job), but it's good at making sure you don't apply too much.
I use this brush with elf's Flawless Finish foundation, and it works like a dream! I've found that it's been getting a lot of product build-up even after cleaning it, but I think that's more of a personal failure than a problem with the brush.
I was recommended the Elf Poreless Putty Primer by a colleague and I am so glad that I purchased it!
It achieves an instant bluring effect, my makeup sits perfectly for the entire day and doesn't clog my pores.
At such a great price it's definitely worth a try