There aren't a great deal of books out there on Software Product Management, so of the two I could find on Amazon I thought I'd start with the cheapest! The intro is OK, but straight after there is a whole chapter on the systems development lifecycle which takes the book off at an immediate tangent by describing a very obscure process which will be alien to most IT companies. This takes up about 25% of the book. Between around page 50 and 140 there is some genuinely good stuff. However the grammar and spelling are appalling and it reads as if the author has just blurted out a lifetime of experience as it came to mind. Suddenly you get to around page 140, the book just ends, and you realise the rest comprises appendices with overly specific pro formas and the like. In conclusion, if 90% of the content of this book isn't blindingly obvious to you already, you probably need a whole course rather than just a book.