I wasn't sure this would really do anything, but it does. It helps the mascara go on smoothly and last. It also helps resist clumping and flaking, and helps lengthen. It seems to help with long-lasting wear.
I love how easy this is to apply to my lashes and it does make them longer for when I apply my Clinique mascara. I also feel like it makes it easier to remove my mascara at the end of the day!