Ask a Texan what belongs in a homemade queso recipe. Some will tell you it’s not queso dip without a can of Rotel and a brick of Velveeta. Others insist it be made with American cheese.

So, which of these two camps is right? I think that the most recent dip looks like a buying opportunity. But even if the shares reached all-time highs tomorrow, buying the stock would still be a ...