I read all six issues of this story arc today. For anyone who doesn't know, the story is written by Gerard Way, of the band "My Chemical Romance." The first story arc won an Eisner award in 2008.
I have to say that it really makes a difference reading the stories in one sitting. The first arc I read pretty much as the issues came out, and I was so confused. I couldn't remember what happened from one issue to the next (and since Mark bags and boards what I've read fairly regularly, it is hard to go back). So, this series, I held on to the issues until they were all out.
Anyway, the story of the special children of the Umbrella Academy filled in a lot of question marks about what happened to Number 5 when he disappeared. We continue to learn more about each sibling, and what they can do. The story refers to events in the first series, so readers should start with Umbrella Academy: Apocalypse Suite.
It is a very satisfying story, and I would read future releases; but I guess I'd much rather wait for the graphic novel collection than read individual issues.