I never really mastered the skinny eyeliner brush and my eyes are too small for the flat push eyeliner brushes, but I love my gel liners so for years I made do with the Bobbi Brown Ultra Fine Eyeliner Brush. Don't get me wrong, the BB brush is fantastic but the MUFE #2S is even better. If you're familiar with the BB brush, picture the 2S as a smaller and flatter version of the BB brush. This makes all the difference in the world because the stiffness and flat shape of the bristles let me fill in the lash line with the same convenience of a push brush but the smaller size gives me more control. The thin tapered tip of the brush lets me draw a perfect wing. I have been able to find excuses to wear all my neglected Bobbi Brown gel liners everday and I couldn't be happier.