Crisis On Infinite Earth, Flashpoint, New 52 and now this. Though rumoured as a reboot, this is more a fix-up like Flashpoint, with one least expected crossover going canon, thanks to Alan Moore. 
 New 52 JL had been a solid run and Rebirth some how picks up from where Darkseid War had left us. And in a way it is weird to have that feeling from a title fabled as reboot. Since each time period needs its own comic run, so that new readers can join in little confused, its a reason well enough to justify the re runs in the past and now present. Except Rebirth could do be a very different experience with background reads, atleast from Flashpoint to other JL events like Trinity War, Forever Evil, Darkseid War etc. Nevertheless, Geoff Johns rebirth title along with Rebirth #1 for each major characters are standalones if you are up for the usual confusion and intents to fix the incongruities. That is actually great considering how fun this main title was 
 Wish I could say the same about art as well. Looking forward to more, anyway and to the episode where Button reappears.