If "no-makeup makeup" is your thing, then look no further than this mascara. As the name implies, it's a great lash lengthener, but it's definitely subtle. If you pile it on you can achieve a bit more impact, but for the most part you're going to get long, thin, natural looking lashes with lots separation.
Where I think this mascara really shines is as a layer. When used in conjunction with a thicker, more volumizing mascara, it's wonderful. I like to use Lash Blast Length as the base layer, and then apply something heftier on top for the best of both worlds: length and separation from the Lash Blast Length, and richer color and volume from the second mascara.