I purchased this brush to use with my Brow Perfecting Duo (which you don't seem to offer any more). The one in the case was very small and hard to hold. The brush is wonderful to use because of the angle.
It has been years since I had used an eyeliner that required a brush (I had become addicted to pencils but they come off more easily). When I moved to Florida from Ohio I decided to try Double Wear Gel Eyeliner due to the humidity. They supply a small brush but I needed something a little larger that would be easier for me to handle. It was so easy to use this one.
I tap this into the chocolate shadow in my Spiced Peach eyeshadow quad, then gently line my eyes and fill in my brows. I like that the color clings to the brow hair for a natural look. The brush puts the color exactly where I want it. The finished eyeliner look is soft.