I bought my first Mac in 1987, and I've used Macs and PCs almost every day since. I bought AAPL stock back in 2002 when many thought the company was going to fold. At the time I was very impressed with Apple's new operating system (OS X), and very impressed with the new iPod. The company had something like $6 per share in cash and was trading for less than $8. Apple was David challenging the Microsoft Goliath. Apple's market share was in the low single digits.
Apple's operating system is superior to Windows, as most experts will attest. To date there have been no succesful virus attacks on OS X, and there exists no spyware to slow down Mac computers. Macs are easier to use and they work great right out of the box. You don't need to buy anti-virus or anti-spyware software for the Mac OS. They will do anything a PC can, and more. If you want to use Windows programs you can run them right alongside your Mac programs using virtualization software such as Parallels or VMware Fusion (I should know, I've been doing it every day for over a year).
Apple has grown its share of the personal computer market from the low single digits to almost 10% in the past six years, and it's not just because the iPod has captured almost the entire MP3 player market. It's because Macs are way ahead of computers using Windows in almost every aspect. Critics like to say that Macs are more expensive, but that's true only from a penny-wise, pound-foolish perspective. If your time is worth anything, the best Macs are cheaper than the bottom-of-the-line PCs, because you'll spend a lot less time keeping a Mac running than you will a PC, and you'll be more productive in the process.
Today Apple has about $28 per share in cash, and it's trading around $80-85. Investors have been worried about Steve Jobs' health, and yesterday we learned he would be taking medical leave through June. Steve Jobs was the key to Apple's success, but will the company falter if he can't return? I think that Apple has built such a compelling operating system, and is so focused on industrial design and innovation, that it will almost surely continue to gain market share in computers, consumer gadgets, and smartphones for the foreseeable future. Jobs has created a culture of excellence and innovation at Apple, and it rests on the bedrock of a solid operating system; that's a winning combination even if he can't resume his leadership of the company.
If you can't bring yourself to buy the shares, you should at least go out and buy one of their computers. Only 10% of the people who read this use Macs.
Full disclosure: I am long AAPL.