As an Austrian who has lived most of his life in Vienna I was simply amazed at the wealth of information this book has to offer. This is by far the best travel guide of Vienna I've ever come across. I have no idea how much time these people spent on researching, but no matter which chapter you're turning to - history, politics, restaurants, shopping, lifestyle - the information is accurate, extensive and, what's most important, to the point.
While some may feel that this guide is more a directory of sights, places and shops, each entry contains lots of interesting facts and details and will almost always introduce you to the greater picture of things.
What's extremely refreshing is the lack of cliché, on the contrary, the authors took great care to point out what's cliché and what isn't, which is a rare commodity with travel guides. The other pro is that this guide doesn't limit itself to the first district, where most tourists seem to get stuck, but rather invites you to the rest of the city as well.
No matter whether you're coming for a few days or weeks, a couple of months or years, or whether you've already lived here for ages - chances are you will find this extremely useful. Not even travel guides published in Austria are this good. *Highly* recommended.