The Good, the OK, and the Ugly
The good:
1.It's fun. It moves right along, characters are well developed, and it follows one character that is easily identifiable as the hero.
2. There are instances of genius, such as AIs with skin, a human dual-processing brain with two people living inside, a living space-ship, aliens that seem like enemy but then turn out to be oppressed and become allies and friends. The conflict of how a humans will come to accept AI. HOWEVER, I'm sure Baron hoped the reader would stick with the slow pace of the first timeline (I almost quit reading at that point) because it is a surprise to have it repeated. In fact, it's like Baron enjoyed writing that section of the saga the most. It seemed like he was having fun. That's good!
The OK:
1.There are assumptions about timelines such as they merge back together if they get out of sync. That's OK because nobody really knows but there are many other Sci/Fi stories that set the bar at infinite simultaneous timelines that this assumption seems outmoded.
2. The main characters are all women. That's OK, women are as capable as men, but for me (a male), it makes it difficult to identify with the main characters. Indeed, it sometimes seems a "forced" role reversal of something like Bill and Ted's Excellent Adventure, to which there are multiple references, simply for the sake of role reversal and could be a better balance. Maybe young girls will love this.
The ugly:
1. It is written on a fifth grade reading level about Middle School girls in very responsible roles.
2. There are short periods of pretty good action with long periods of teen humor and small-talk. Boring. It's as if the publisher required a certain length, so chit-chat is added as filler.
Over all it is a fun story and does work.