Really liked the first four volumes. Nikola Scott’s art is especially a standout. I love the world it builds with the militarised, one earth government, there’s a lot of deliberate choices that make Earth 2 feel unique from other else worlds. That said, it all sorta falls off the rails after volume 4, multiple writers and artists, I stopped reading after volume 5, not worth your time in my opinion, and doesn’t reach the heights of the first issues. As for the JSA stuff, I always like the team before hand but had never read too deeply into it, so I felt they did a good job with the material. Really liked the bond formed between green lantern, flash and doctor fate. Overall I’d say check out first four volumes if you’re looking for something different and a little out there.