Does an alright job
I don't think this product is really a necessary step for me. What it does do, is add volume. It's great if you have a favorite mascara, but want a little more volume or want more of a false lash look. It doesn't add a lot, if any length to my lashes. So I only use it occasionally, when I want super massive lashes!
If you have short, thin lashes, this product may work wonders for you. Since I have naturally long, thick lashes, it doesn't make much of a difference.