Yeah, I also noticed that some of the reviews are a bit contradictory. I was smiling a little bit about the twitchiness comment with a bike that has a 64deg HTA and 170mm Fox 38.

Maybe the guy was dragging brakes on descents? Although one could extend the fork to 180mm with a new air spring... Santa Cruz seems to approve 180mm on this bike.
As mentioned above, real world customer builds at least on X01 level seem to come with DHX2 and based on SC employee comment on one video, I think it will be the factory model. Personally pretty happy with the price/value on the X01 kit especially after the discount I got. Carbon everything, Kashima everything, etc.
I was also thinking about the EP8 rattle. I have a hunch that it might be greatly reduced by upgrading the DT Swiss 350 rear hub to 54T engagement points. This should reduce jolting motion in the chain when coasting. Planning to try the bike with the out-of-the-box setup and then compare to 54T.