I honestly know very little about the Legion. I'm sure that I would have understood a lot more of what was going on and been a lot more invested in the characters if I had. But Geoff Johns can write a good story, even if I'm in the dark going in. Ok, there may have been a little too much alternate dimension stuff going on, but even with big, huge stuff taking up most of the space, there was still interesting, smaller scale stuff (you know, like character and relationships) that actually kept me reading. Superboy Prime is a love-him-or-hate-him villain, and I both loved and hated him here, as I do nearly every time he appears. He's so over the top that it's easy to get some amusement out of him, especially in his last few pages (which I thought were hilarious- we are Superboy-Prime and he is us). Solid art from Perez, gorgeous covers, and historically significant (for the resurrections of Superboy and Kid Flash), so it's very much worth a read.