I bought it because it was blue
I've previously had my lashes dyed navy blue and I liked it. So I wanted to try a blue mascara.
This one is a good colour for me, and it feels subtle and easy on the eyes to wear. It doesn't make my lashes ultra thick, long or curly, but it did what I wanted, which was to bring out the colour of my eyes.
I've deducted a star because it's no longer available in blue. If I were to buy a black one, I'd revert to the Long Lash or the Bold.