I thought that because this polish had both silver AND black hex glitters in a black jelly base (as opposed to the OPI one that has only silver) it would be different enough. The truth is, once it is on, you cannot tell the difference between the black and the silver:
Here is just one layer. You can see the black and silver here:
And here is a shot of Revlon (top) next to OPI (bottom):
What do you think of "Sparkle Aplenty"? Will you skip out on this one, or pick it up? (It is "Limited Edition" afterall :) Those are the magic words). I'd skip it, especially if you already have "Metallic 4 Life".