Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of home beverage system specialist SodaStream International (Nasdaq: SODA) plummeted 16% on Wednesday after its quarterly results disappointed Wall Street.

So what: SodaStream's first-quarter revenue and adjusted earnings jumped 32% and 21%, respectively, but unit sales growth of just 8% is triggering big concerns over waning popularity. As fellow Fool Rick Munarriz noted, however, the 38% spike in consumables (CO2 carbonators and flavors) suggests that the machines are being put to good use and are far from a fad.

Now what: Management now sees full-year adjusted profit of $44 million on revenue of $370 million, nicely ahead of Wall Street estimates. "Looking ahead, we continue to invest in product innovation and strategic partnerships, consumer education and brand building, retail and geographic expansion, and capacity increase ahead of demand," said CEO Daniel Birnbaum. "With these key components in place, we look to 2012 and beyond with great anticipation." For growth investors willing to take on some risk, today's sell-off might be a good chance to bet on that optimism.

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