I received the same message today.
I assume that means the resin is the same but the Duramith is an extra step for the surface treatment increasing the hardness.
I sent them an email two days ago asking if the new Centennial balls use Durimith. My guess is they don’t, Brunswick web site doesn’t mention Durimith.
I’ve played there several times and really like the room. Unfortunately I’ve never played anyone there and left after the special was over and walked to Skyline.
A real nice matte black GC4 is going to fall into my lap for about 3k. Are you happy with your Diamond over the GC4 that you got rid of? I’ll be getting sub rail extensions and probably Artimis. Not sure if I want 4 1/8 or 4 1/4 corners.
I had a chance to get a nice red label a few years ago for 3k but we weren’t ready with our new house. I just passed on an older Professional blue label for 6k but my wife didn’t like the reddish color. I kinda want a Diamond but a nice matte black GC4 with matching light is falling into my lap...