While Fools should generally take the opinion of Wall Street with a grain of salt, it's not a bad idea to take a closer look at particularly stock-shaking upgrades and downgrades -- just in case their reasoning behind the call makes sense.

What: Shares of Netflix (NASDAQ:NFLX) rallied 5% this morning after Goldman Sachs upgraded the video streaming gorilla from neutral to buy.

So what: Along with the upgrade, analyst Heath Terry boosted his price target to $590 (from $380), representing about 34% worth of upside to yesterday's close. So while contrarian traders might be turned off by Netflix's price strength in recent weeks, Terry's call could reflect a sense on Wall Street that the company's subscriber growth tailwinds give the stock plenty of room to run.

Now what: According to Goldman, Netflix's risk/reward trade-off is rather attractive at this point. "As Netflix leverages the growth in the connected device ecosystem and continues to expand internationally, we believe subscriber growth will continue to exceed expectations, driving margin expansion through significant scale benefits in content sourcing, customer acquisition, and technology," said Terry. "While Netflix has outperformed the sector significantly since a pricing misstep in 3Q11, at 26X 2015E EBITDA on almost 50% 3-year EBITDA growth compared to the Internet sector at 14X on 30% growth, we believe the potential for further outperformance is high." Given Goldman's solid call-making track record -- currently ranked in the top 15% of our CAPS community -- growth-oriented Fools might want to take a closer look at Netflix.