I generally don't like first person narratives, but I enjoyed this book very much. It's very engrossing, suspenseful, and believable. The characters are likeable and consistent, even admirable. One of my friends dinged the book by one star because he thought there was too much tedious engineering detail. It's true there was a lot, but I somehow feel it was important. It demonstrates what an amazing accomplishment Mark's survival is, plus I think it helps the reader to understand how tedious the work must have been for our hero. And it clearly was, as well as terrifying.
I strongly recommend this book to anyone who likes suspense. Not limited to sci-fi. In fact, I don't even really think of this as sci-fi. It's near future speculative, maybe. Not just plausible, but entirely possible.