Since the other thread has been completly derailed into another direction, I figured I should make a new one, where you can post your thoughts on the actual comic.
With that said..
Ridiculously, amazingly good.
There's so much information, so many ideas and creativity that it's basically exploding from the page.
It ties back to Final Crisis and Superman beyond - that the worlds of the Multiverse sing together, everything is made out of vibrations, going all the way to the pure ideas.
This world's Superman (who is the president, as you know) encounters a (dying) Clark, Jimmy and Lois from a parellel Universe, travelling through a machine built by his world's Lex Luthor. In that parallel world they were basically Siegel & Schuster analogues - they used the vibrations to make pure thoughts, ideas you could touch, and in that process they came up with the perfect idea, the perfect man - Superman. They imagined "a champion, a thought-powered redeemer capable of saving the world. A made-up messiah" with a "code of ethics so pure and simple and good that we all wept" - and the reason they created this perfect, unbeatable idea was for the simple fact that they wished they could change lives, that they could inspire people - an idea bigger than actors, or rock stars. They imagined something bigger than themselves.
As in real life, their idea was bought by people who eventually strayed away from what it truly was supposed to be, and they created the "violent, troubled anti-hero" who is now hunting them across the Multiverse after being perverted by the thoughts and failings. Superman stopped being something meant to inspire the people out of their weaknesses, their fears and prejudices, and instead became a reflection of them. The same way Siegel & Schuster, or in this case, Clark, Lois and Jimmy wanted to be the ultimate beacon of hope of inspiration, while other people want him to be something else - it's a rather meta-critique on the way Superman's characterization and personality have changed over the years to 'fit' the times/writer's whims, moving further and further away from what he is meant to be, including the concept of 'superhero' in general.
There's so many details and tidbits to comment on, but it's better just to read it for yourself. THIS is exactly what I hoped Grant would deliver when he came on board, and he does so in spades.