I have a Epon E.M.S with Tour ad DI-6s shaft.
The weight of head is less than 200g so that it is easy for swing with DI-6s. Therefore, the surface of contact face is coating with "some" metal, i guess is Ni. So the voice of E.M.S is not loud but clear. I think it is a great improvement to E.M.B including the scorpion mark. The feel of E.M.S was direct, longest, straight. This driver was very easy to hit the longer ball and still have a great, forgiving feeling.