As the highest-valued company in the world with a market cap of $2.5 trillion, Apple (NASDAQ: AAPL) regularly makes headlines. The launch has had highs and lows, with the costlier models seemingly outselling the base versions for the first time in years. Regardless of what might play out with Apple's latest iPhones, the company has consistently proven its resiliency in the market -- and that the MacBook manufacturer is an asset to any portfolio looking for long-term gains.