Apple (AAPL -1.96%) is one of the most closely watched stocks on the market today, with a best-in-class line of products, and unbelievable returns for investors over the past decade. But shares have fallen 25% from the company's all-time high, which it hit in September. Has the Apple investing thesis changed, or is Apple still a buy for the long term? In this video, Motley Fool tech analyst Andrew Tonner tells us why shares are down, and whether that makes Apple a buy today or not.