This is my first time using an adjustable eyeliner! I bought it after seeing the packaging that said, "Even in a storm!" I usually use pencil-type products, so I'm still not used to using it, but the tip is quite thin, so even if I use too much, it doesn't seem like it will get sticky. When I applied the eyeliner to the inner corner of my eye instead of just the outer corner, I closed my eyes right after applying it, so a little got on my eyelid. After using it for a day, even though I sweated, one side of the lower lash line did smudge a little. In conclusion, it was reasonably durable and resistant to smudging. Also, since I'm used to pencil-type products, it was a little difficult to use for me.