in all likelihood, average investors will not get much out of this book, as average investors don't pore over 10-ks, annual reports and conduct industry analysis prior to investing (which they should!). but for those above average investors who do (read: intelligent investors, per ben graham), this book is an excellent read.
2/3 of the book deals w/ alterting the investor to some of the areas where company mgmt can play games w/ the #s in order to goose the stock price. the examples were helpful, but the insights were not exactly earth shattering for experienced investors.
however, the last 1/3 of the book, on forecasts & security analysis, is worth the price of the book. in 100pgs, you get an MBA-level text on security / credit / financial statement analysis, complete w/ ratio definitions, caveats(!), and applicability. excellent stuff for the beginning or experienced analyst, and i will doubtless refer to the last 1/3 time and again.