If a surface with an mia mat isn't reflective at all regardless of reflectivity value then you may want to check your surface normals. By default, "skip reflections on inside" in the material's advanced reflection settings is on so back facing geometry will not calculate reflections.

Speaking of reflections, a lambert like shader wouldn't do counter tops justice. Even matte ones tend to reflect the environment to some degree, it's just that the roughness of the surface would need the reflections to be blurred in some manner.

Googled refs