Basically I agree with Matthew N Palmers review. I agree that the author doesn't paint a particularly good picture of himself. I also found the scientific info presented was fairly lacking, so I didn't have a clear picture of what was actually going on in some of the experiments. However, whilst I was a bit disappointed with the lack of depth on the science side of things, the book was interesting as an autobiographical text and also as a reminder that "cybernetic"/AI/robotic technologies (not just specifically implant - which in itself isn't a new technology) are "on their way" from science fiction, well into the here and now.
A specific point I'd make is: The author says in the book how frustrated he got with people saying he hadn't really achieved anything. Yet in 300 pages, I personally felt he hadn't countered this argument very well. Implant technology exists and ops take place routinely, radio transmission technology exists, internets and data acquisition by computer are old technologies. The author bolted them together and tested to see if they worked. Of course they worked. Why wouldn't they? It seems to me (perhaps I'm mistaken) that the only novel technology here is the nerve interface (in human) and then the novel data was that info recorded via the interface.
A lot of the other stuff detracted or confused what was being achieved. There was a lot of old science incorporated into this book..... Once the transducer has got the signal from the neuron, then it's just the same as any electrical signal. You don't need to perform an experiment to see if the transducer can control a light, a wheelchair etc. because you know the answer to this already. This stuff was more about demonstration than experimentation. I'm not saying that these demonstrations weren't valuable, I just think that they actually clouded the more experimental science done which was : The capture (and interpretation) of nerve signal information by means of a direct electrical interface into a nerve.
As I said, whilst the author doesn't come across as the sort of person you'd want to be down the pub with, I did enjoy reading his about his drive and his frustrations achieving his goal so as an interesting biog rather than an informing science book, I'd give it 3 stars.