Now this is how you start a Team Comic
I'll go straight to the point: This book is way better than Justice League #1. It goes right to the chase; presents all the characters, gives us a glimpse of how they work, and introduces the conflicts all in 35 pages.
Another thing I like is Booster; he retains his post-52 personality and maturity (which hope means he's still the Defender of the Timeline). I still hate his new costume though.
What I don't like is that this comic gives me the impression that all the old JLI comics didn't happen; I really liked those, and the relationship between Booster and Ted.
Overall a great book and a great start.