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TL;DR:  Sproutcore is a huge framework, and this book will save you a lot of time (and headaches). Buy it. Disclaimer : this is a review of a free copy that Packt kindly sent me. Win a free copy of this book, scroll down to know how to participate! If only I had this book 3 years ago! 3 years ago I started developing a Sproutcore app as a learning experience and, in all honesty, the path has been rough. Sproutcore is a massive  framework with lots of features: some are well documented, some mentioned casually in the guides, some others...well you don't know they are there until you start reading the code or chat with one of the more knowledgeable devs in IRC.

Disclaimer: Packt kindly sent me a free copy for review. TL;DR: Rating 4/5. Recommended for beginners and intermediate. The book itself is short, but packed with information. A fast reader with some experience with OpenNMS should be able to finish it in 4 to 6 hours. Beginners will probably want to follow the pointers to the online documentation, check the configuration files and possibly experiment so they should allocate more time. Before being published the book has been reviewed by Jeff Gehlbach. Anyone who has been involved with OpenNMS for some time know him, as he is one of the many brilliant minds working for the OpenNMS company, the commercial entity which develops and supports OpenNMS. Surely his involvement serves as a kind of seal of quality for the book. I for one was surprised by the clarity with even the most complex aspects of OpenNMS were presented in such a short text. Instant OpenNMS Starter is divided in three main parts: installation, quick start...