I have several of these FlatLiners and for the most part they're great, but the Blackout one didn't impress me as much. It seems to apply a little 'choppy' and isn't as intense a black as I'd like. If you want a stay-put pencil that isn't solid black, then this might work for you. I was hoping this might also work on my inner rim, but it doesn't work well for that either.
The coloured ones are wonderful though and seem to apply more smoothly, especially the Great Lawn and Brownstone.
I won't repurchase this one, but I would certainly repurchase some of the other ones.