The new wm9 tt sub is without getting into the gold parts, the best you can buy, mainly because it has the correct crown position. Evenso is the new LV sub.
With regard to the gold, it looks like it is going to be truly wrapped gold, although after polishing a thin layer (still much thicker then plated howerver).
Whatever the outcome of the gold, the watch should last a lifetime considering it accepts genuine parts like the WM9 YM, so in any case the gold craps out, one can buy en gen or aftermarket gold bezel and or bracelet.
So to sum it up... key parts are the truly 1:1 case, and a good dial, especialy the blue TT sub dial seems hard to replicate colorwise.