Initial Impressions 8/31/17: I think this may have been the best book of the series for me! I really liked how everything came together and it was nice to follow the story having gotten to know these characters and really get into their histories. I really enjoyed the conclusion and that it included even deeper layers of these worlds and how they entwined with each other. 
 One thing I always have a hard time with in sci-fi books is how much science the reader should really be exposed to. We knew the Firebirds worked and that there was a lot of physics and science behind them, but I always found myself wanting to know just a bit more about the science behind it. I understand we don't want to bog readers down with complicated explanations but I always feel that it adds to the world-building (at least personally, for me) and adds that sense of reality instead of just saying "we created these with science and the science works". Obviously there's no real technology like that (at least not that the public knows *cue conspiracy theory music*) but I was left wanting just a biiiiit more of an explanation of why the science made it work the way it did. There were descriptions of how the Firebirds worked but I wanted to know how the science made those functions possible. Maybe I'm going one step too far, haha. 
 Anyway, I found this book really enjoyable! The whole series was a very solid four-star read for me but I never quite fell head over heels for it, and I think that was because of the characters. They were all very good characters with depth (as noted in their different personalities in different dimensions), but I just never LOVED them. I did love all of the different universes and I'm still impressed with how much time and thought went into each one of them. 
 Listening via audio, I did find one discontinuity which wasn't a big deal but it really bothered me for the brief moment that it existed and I need to get it off my chest haha! So I'll put it in spoiler tags: (view spoiler)[So when Marguerite talks with all of the other Marguerites in the clone-verse, how come all of the other Marguerites begin speaking with their own accents? When Berkeley-verse Marguerite visits other universes, she speaks with that host's accent, yet the visitors to the clone-verse were speaking in their OWN accents and didn't take on the accent of their host. It just went against everything that had been set up in previous books and didn't affect the plot at all but I just felt like it should have been caught. And my friends who read the book (not listened) didn't even notice, and I'm not sure I would have noticed either if I hadn't been listening where the accents were such a big part of the experience. So doesn't really affect anything but I didn't get it. (hide spoiler)] 
 So TL;DR, this series was very fun in terms of concept and set-up! I didn't totally love the characters -- mostly the romance. I don't know why but I never fully got on board! I think I liked Theo better, to be honest... I love the rakish rogues, what can I say? -- but it was a super solid series and I loved the creativity and detail!