The Concrete formula gives a rough texture to the nails which means you have to leave them without a topcoat. You can of course wear a topcoat but you then lose the texture. It's a different kind of effect - leaving the nails almost bobbly and semi-matt, of which I think I like it in this shade the most.
The Concrete polish removes as easily as any other polish, however I found it chipped after one day of wear which would stop me from reaching for it as often as I would perhaps like to.
What do you think of the Concrete polishes? Will you be wearing them?