Feeling pretty good about myself right now! I actually finished this book in a month's time whereas the previous few books this year have taken me each a little over 30 days. The middle portion of this book about RIM's rise and fall is a bit slow, but very quickly, as the book progresses into RIM's failing years (starting about 2007 and on and getting more serious at about 2010) the book takes a turn that makes you never want to put the book down. It's similar to watching a trainwreck occur I guess. You can't stop reading about all the stupid decisions being made (but of course you're reading it all in hindsight).
For the tech-obsessed, it's a great read. I don't know if this book speaks to a larger audience since it gets a bit technical at times, but the authors Jacquie McNish and Sean Silcoff do a good job of even making those portions easy to digest. I'd still recommend it. Get it here.