It's really not your typical space opera nor near-future cyberpunk science fiction story. Well-written and combining various elements of science, space exploration and humanity, it was a compelling and oft-times humourous package.
Given that this is the final chapter in the many adventures of Bob, I will refrain from mentioning anything about the plot to avoid even the tiniest potential spoiler. I will, however, relate why I wholeheartedly enjoyed this entire trilogy.
Firstly, it satisfied the geek in me. The one who yearned to have the opportunity of space exploration and at the same time realised that the time and distances being contemplated are just simply too vast and incomprehensible for a mortal's lifetime. The technological advances that the Bobs eventually brought to fruition was realistic as well as it didn't feel way too expedient nor convenient. The Bobs also had to contend with resource bottleneck and management when it comes to producing enough vessels, stasis pods for the migrating human colonies, and ordnance for defence.
After a full century since the original Bob woke up to discover that he became a computer programme, what I'd prefer to call nonbiological human intelligence as artificial intelligence just doesn't cut it, the engineer in him had made significant leaps in advancement for the human race to start colonising other planets. However, dealing with an even more advanced power-hungry alien race was another matter altogether.
The writing style was accessible while maintaining some elements of hard science and astrophysics, such as time dilation of space travel and all the other abstract concepts that come with this field. It was the audiobook narration that truly made a difference to my enjoyment. Ray Porter injected personalities into the Bobs, with distinct yet subtle nuances between the many generations of clones from the original Replicant.
The episodic feel of the story gradually begun to fade as the narrative moved towards an event which was suitably climactic. The switching of first-person POVs between the key Bob characters (that's the first time I ever wrote a phrase like that) was executed seamlessly in my opinion.
What I love most about this story was how it dealt with the aspect of what it means to be human. Bob was not an AI learning to have emotions. He was essentially human; simply a nonbiological one with all the capabilities to feel love, happiness, grief, sorrow, regrets.. the whole shebang. Through the various Bobs' engagement and inevitable relationships with "ephemerals", there was quite a lot of emotionally-charged moments as the reality of outliving their loved ones hit hard, as in really really hard.
Their lives were now less than a footnote in history. As gone, as utterly forgotten as any random individual from the Middle Ages. No longer even a ripple in time, except to the extent that I could keep their memories alive.
With that, I have to say that I highly recommend this series to fans of science-fiction and space geeks, and especially for audiobook fans of this genre.