A friend swore by it, so I tried it a few months ago. It's very messy and there's a real learning curve. It definitely gives you long lashes once you get it figured out. You basically coat a black gel on your lashes and then drop flakes of the stuff on top of that and then coat it again with the gel. However, I found that it flaked off over the course of the day and left a mess on my face. It was pretty embarrassing when I realized I'd walked around probably for hours with mascara flakes under my eyes.
It definitely does give you really, really long lashes, but I eventually gave up. I tried following the videos and listening to the rep's advice, but finally decided it was just easier to use my Great Lash mascara.