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 Glu Mobile (NASDAQ:GLUU) gained 3% this morning after Benchmark upgraded the mobile-game publisher from hold to buy.

So what: Along with the upgrade, analyst Mike Hickey planted a price target of $5.60 on the stock, representing about 26% worth of upside to yesterday's close. So while contrarian traders might be turned off by Glu Mobile's Android TV-related pop yesterday, Hickey's call could reflect a sense on Wall Street that mobile gaming trends give the stock plenty of room to run.

Now what: According to Benchmark, Glu Mobile's risk/reward trade-off is particularly attractive at this point. "In our view, management has renewed credibility, from recent product success, after a significant retooling of their development expertise," said Hickey. "The Company's product portfolio and subsequent financial performance should benefit from the rapidly expanding smartphone/tablet hardware device market and related consumer software ecosystem." With Glu Mobile continuing to boast a rock-solid balance sheet and shares that are still off more than 20% from their 52-week high, the downside might even be limited enough to bet on those prospects. 

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Brian Pacampara has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.