Trying to predict where the market will go over the short term is next to impossible. But when you're searching for potentially profitable places to park your hard-earned cash, you might want to start by considering companies with particularly happy customers. With this in mind, let's look at three companies that clearly do please their customers, based on a metric called the Net Promoter Score (NPS). 

NPS is a metric that's based on people's responses to a single survey question along these lines: "On a scale of 0 to 10, how likely would you be to recommend this company, product, or service to a friend or colleague?" That key question is usually followed up with a question or three attempting to gauge why each respondent gave the answer that they did.

But it's that first question that counts. Those who respond with a 9 or 10 are classified as "promoters" -- customers who will keep coming back, and more importantly, who will enthusiastically recommend the business to others. Those whose answers are 6 or lower are the "detractors" -- folks who will disparage the company or its products. Subtract the percentage of detractors from the percentage of promoters, and you get the Net Promoter Score.

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Source Fool.com