The Six by Mark Alpert

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Synopsis:
Exchanging their bodies for machines, these teens will defy expectations, brave danger, and defend civilization. They are The Six.
Adam's muscular dystrophy has stolen his mobility, his friends, and in less than a year it will take his life. Virtual reality games are Adam's only escape from his wheelchair. In his alternate world, he can defeat anyone. Running, jumping, scoring touchdowns: Adam is always the hero.
Then an artificial intelligence program hacks into Adam's game. Created by Adam's computer-genius father, Sigma has gone rogue, threatening to kill Adam—and the entire human race. Their one chance to stop Sigma is using the technology Adam's dad developed to digitally preserve the mind of his dying son.
Along with a select group of other terminally ill teens, Adam becomes one of the Six who have forfeited their failing bodies to inhabit weaponized robots. But with time running short, the Six must learn to manipulate their new mechanical forms and work together to train for epic combat...before Sigma destroys humanity.

I thought that Adam was an interesting main character. He has muscular dystrophy which limits him in many ways but he tries to put on a brave front for those around him. He uses humor as a way to cope with his situation and is extremely smart.  I wasn't able to connect with the other characters in this book like I could with Adam. The other characters didn't seem to have as much depth to them which made me want to ignore them for the most part. 
The story itself was fast-paced and tense. I found it to be both thrilling and intellectually stimulating. It was difficult to guess what Sigma would do next and how the Six would be able to counter the AI's attacks. I thought that it was interesting to see Adam's reaction to becoming one of the Six. He was unsure if he was still himself or just a copy of himself. I don't know very much about technology but thought that it was an intriguing thought. 
I thought that it was a nice touch for the author to include Sigma's communications as well as the general's communications with the higher ups regarding Sigma's movements. It added another element to the story providing it with another level of tension and background information. It also provided readers with the "big picture" not just the teens emotions and their training.