I first saw this on a coworker and I just had to try it for myself. Trust me when I say I had to search quite a bit to find this! It was so popular it was sold out pretty much everywhere!

You need a good coat of nailpolish under the shatter polish, and remember, as this is a black shatter, a bright colour underneath will look the best. You need to apply a thin layer of shatter polish to get a really good shattered effect.

All in all I think it's very cool. It gives a very nice shattered effect and sort of gives the base colour a new look. I would recommend it. However the price is quite steep, I'm hoping to see other not so expensive brands come out with their own version of this.

I've seen many youtube videos about shatter nail polish, it goes on over another color and the effect of one of shattering (broken glass) but in black, O.P.I only has the black color but there are other companies that have other colors with the shatter effect.
I got my black shatter at a beauty supply store and it was more then I usually pay for nail polish but it was a buy one get one free so I also bought Green-wich village (a grassy green color) to layer under the black shatter.
The black shatter takes some practice, it needs to be over another color as it doesn't work on bare nails and you have to be quick about the application because if you put it on too thick, the shatter effect is wider and not as detailed.
It lasts well as long as you put a top coat on over top and it dries very quickly.
One drawback is that when it dries, it pulls back from the end of the nails (shrinks) but as long as your base color is on, it looks fine.
I would buy it again as it looks cool and if they come out with more colors and if it gets cheaper.
I'm sure you can buy it cheaper at other stores but there was only one store in my area that carried it.