Here is what I didn't agree with:
1. Almost anywhere Piper says "God must" I disagree with him. The only place I think we can confidently say that "God must" is where God himself says "I must" since Jesus says “With man this is impossible, but with God all things are possible” and even when referring to his own crucifixion he says "My Father, if it is possible, may this cup be taken from me. Yet not as I will, but as you will" so saying what *must* be done is something I think we should be very careful about saying when it comes to God.
2. I do not think this is the whole story around Romans 9:1-23, I think there is something in the fact that these are *vessels* unto honour or dishonour. Yes, God foreknew those that would be saved. Yes, they are *the elect*, but I do not think that this is the whole story. There are plenty of places where God judges the wicked and praises the righteous like Job or David. I think God will share with us the full reason he justified those He justified and I don't think it will be completely arbitrary. I think *all* will see it as just, even if we can't fully grasp it right now. Essentially, I think we need to take it on faith for now, and once it is revealed it will make perfect sense to us.
Ok so with that said, when it comes with the core argument of the book, I think Piper is right and I think his argument is bulletproof. Reaching into Exodus and highlighting the glorification of The Name of God and sticking with the details in and around Romans 9:1-23, diving into Greek and Hebrew where necessary, but not hinging the entire argument on trivialities, I can't see how his core argument is incorrect.
God has sovereignty to justify who he wills, and it is in service to his glory to do so. This justification is across all tribes, nations, and tongues; but it isn't to all people. It is preordained and predestined, but it is nevertheless just.
These points I think he proves as well as he can to me. That I don't think it is the entire story is okay. The central thesis passes and a greater understanding can only make this more beautiful.
The only point I would add that I don't recall Piper dwelling on is that, ultimately, we will observe and share in the glory of the Lord. So even here, the aims of God are ultimately for the benefit of us, his elect.