I disagree with his view that morality is objective and I would say that different people would propose different landscapes which undermines the whole thing. But to be honest I haven't read the book and maybe he makes some good points. But from what I have read fo him so far I don't have high hopes. He regularily says some horribly naive things concerning morality.

As I recall, I don’t agree with it totally, but I only dimly remember it now. Seems like he says that morality is some kind of objective fact that cannot be denied, even though it has nothing to do with a god? Is that in the ballpark?

I think Jordan Peterson's concept of the moral landscape will become the more accepted opinion in the near future. That said, Sam Harris is a great thinker.

I haven't encountered any way I disagree with it thus far.

Damn, I missed that...