This book is actually pretty good.
Its content is honestly almost everything I'd want from a book like this. New cyberware, new bioware, new genetech, new nanotech, and the return of many classics. Some amazing new qualities and life modules. It has advance medicine rules and the return of "brain hacking." But strangely no rules for severe trauma, which was one of my favorite optional rules from SR4's Augmentation. There are also expanded rules for drugs. Not just new drugs but custom made drugs too.
It starts off with some great fluff about an elf that became a Street Samurai, and the danger of watching your close friend turn into a meat sack housing a psychotic AI. A lot of people complain about fluff in the core rule supplements, but screw them. Fluff is awesome and helps set the world. With that said, there might be a bit too much fluff. The first 50 pages are pretty much pure fluff, and that's just a lot to take in when I want to start seeing the meat and potatoes of the book.
There are however many downsides to the book. The threat section talks about a lot of awesome classical threats, like the advancements made in cyber zombies, but there are no rules for them! And it's true that the SR4 rules for them are still entirely applicable to SR5, but still seeing the rules updated for SR5 would be nice. The Table of Content is also total garbage and is pretty much unusable.
Over all, the content is what I want to see, and if you're playing anyone that might want some ware installed into their meat body, you should pick this up. It's well worth it.
[4 of 5 Stars!]