I use this for edge highlighting on my Space Marines and the matt finish blends perfectly with the base coat. The 12ml pot feels small but a little goes a long way with how thin the layers go on.
Warpfiend Grey goes on so smooth, and the matt finish dries flat without that chalky look cheaper greys get. Built up three thin layers on a cloak and the highlights stayed crisp the whole way. 12ml is small, but a little really does stretch.
Layered this over a dark base and the coverage was impressive for a grey — two thin coats and I had a smooth, matte surface ready for highlights.