This book is just a lot of fun. There's nothing important going on - no there there - but for anyone, and I really mean pretty much anyone, who grew up in the 80s, you're going to love it.
You're not going to love the first 100+ pages wherein Cline explains both technology and the 80s to people who don't know anything about it. Because you lived it and are now living it, this will seem boring, repetitive and useless. Skip it! Just blow right past those parts and get to the section where he discovers the first clue.
Cline is very smart in one specific way: he created a whodunit as a puzzle, one that (if you're smart enough, which I am not) you can figure out as you go along. Making your readers feel intelligent and powerful - oh, yes, you've hit the nail on the head, Cline.
I would actually read a sequel, if he were to write one. For instance, does he save the world from abject poverty? Oh, right, that'd be a different kind of book. Also, I suppose I will watch the film when it's done, but only if they don't hire a Fanning for any of the roles.