This is one of my first forays into sci-fi as a genre and I think I made a good choice.
Even though the setting seems somewhat far fetched the story and the way the fictional society evolves is surprisingly relevant.
The only major gripe I have with the book is the last quarter which sadly becomes somewhat anticlimactic after a fast paced and interesting beginning.
The book is in a way split in three parts which in turn deals with the realization and preparation before a catastrophe, the actual catastrophe and the aftermath.
And since all the parts seems to be well researched and the science behind them at least plausible I found it easy to get caught up in the story.
In short I'd say that it's a good entry point into the world of sci-fi even though the disappointing end lets it down.