This book hits on a major topic of interest in today's modern market - ETF's and how to prudently create a modern portfolio using them w/o just sitting back and employing the buy-hold-forget theory. And for others, trading equities and trying to pick winners while avoiding the losers is simply too difficult and time consuming, especially if one has another day job! Targeting sectors and industries just makes sense and I thought his "momentum" style of investing was better counsel than what I have ever heard from the various "professional" investment advisors I have used at the big brokerage houses using the "diversified pie chart approach". All many of these guys do is take your money and invest it with money managers (pass the buck and all decision making except annual rebalancing) who, in turn, make the decisions - all while each cog in the wheel takes a point here and a point there in fees. As we all know, that diversified pie chart approach (large cap, small cap, int'l, growth, etc.) has been pretty "correlated" in the past decade - and not in a good way!
I think some people missed the author's "tongue in cheek" humor and took some of his words too literally (like the fact that he is an impatient investor, etc). I personally found his comments humorous - as much as can be hoped for in a book of this nature discussing pretty dry material.
The fact that Sam provides an opinion in the end is a real bonus and I credit him for taking a stand and telling us his #1 preferred method.
So the flaw - as others have pointed out....there is no discussion of the after tax implications of his system. The fact that one portfolio churns nearly 300% annually as compared to the S&P's lower annualized return but mere 5% churn. It would have been easy, given the author's background, to provide 1-2 tax brackets of examples as to the after tax returns and short versus long term gain issues implicit in his system. He does discuss the merits of using retirement money, but certainly many of us will consider using our taxable accounts as well. I may estimate this myself (best I can) and then compare this back to the regular old S&P performance to see if his system still has legs in the end. All in all - a very good read!