The brush is difficult to use. I think it depends on the person, as there are many reviews saying that the brush is easy to use, but for me it was difficult to use. Even after applying, I don't feel like the liquid is getting on my eyelashes. (My eyelashes are not wet) There seems to be a lot of serum on the tip of the brush, so when I apply it on the tip, it gets on my eyelashes, but it's too much. In terms of ease of use of the brush, I prefer Majo Majo.. Good pointsI feel like my eyelashes have grown a little since I started using it, and I think my lower lashes have grown more.