Investing isn't easy. Even Warren Buffett counsels that most investors should invest in a low-cost index like the S&P 500. That way, "you'll be buying into a wonderful industry, which in effect is all of American industry," he says.

But there are, of course, companies whose long-term fortunes differ substantially from the index. In this series, we look at how individual stocks have performed against the broad S&P 500.

Step on up, Stanley Black & Decker (NYSE:SWK).

Stanley Black & Decker shares have roughly matched the S&P 500 over the past quarter-century:

Source: S&P Capital IQ.

Since 1987, shares have returned an average of 9.8% a year, compared with 9.7% a year for the S&P (both include dividends). One thousand dollars invested in the S&P in 1987 would be worth $19,200 today, and, naturally, about the same in Stanley Black & Decker.

Dividends accounted for a lot of those gains. Compounded since 1987, dividends have made up 53% of Stanley Black & Decker's returns. For the S&P, dividends account for 39% of total returns.

Now have a look at how Stanley Black & Decker earnings compare with S&P 500 earnings:

Source: S&P Capital IQ.

Some outperformance here. Since 1995, Stanley Black & Decker's earnings per share have grown by an average of 6.7% a year, compared with 6% a year growth for the broader index.

What's that meant for valuations? Stanley Black & Decker has traded for an average of 19 times earnings since 1987 -- below the 24 times earnings for the broader S&P 500.

Through it all, shares have been average performers over the past quarter-century.

Of course, the important question is whether that will continue. That's where you come in. Our CAPS community currently ranks Stanley Black & Decker with a four-star rating (out of five). Care to disagree? Leave your thoughts in the comment section below, or add Stanley Black & Decker to My Watchlist

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.