That sounds ridiculous to me. In the general picture here, Macs are not cheap, but aren't too expensive either. I wouldn't mind paying less for one, but that's not the point. My point is, competing computers customized with similar specifications end up being around the same price range. I saw somewhere that the Dell XPS One was a few hundred dollars more than the 2.4Ghz iMac (20-inch) with lower, base specs. If Macs are so expensive to the point where most people avoid purchasing them, then that doesn't explain why they would go buy the alternatives. Look at Alienware, Dell XPS systems, higher-end HP computers, etc. From my view, there's not much to base this claim on.
Windows probably is more secure, but not by much, considering the fact that Windows still has more access to inner files and the like, while OS X does not. That, and you usually have to install security features and stuff... I think you understand where I'm going with that. Anyway, OS X would be a good target, but we mustn't forget that it has pretty good security too. And, Apple tends to find the exploits themselves and keeps them quiet for the most part, reducing a few risks ever so slightly. "For the masses"... I disagree. It depends on what each person needs, and OS X is much easier to use in my opinion. It's only hard to adjust from Windows once you switch. That said, Windows is far better for gaming because of DirectX, where OS X is lacking. In the future, Apple may decide to improve the system for gaming since they already have graphics in the bag, but who knows.
You could make the argument that Leopard was just a new look for Tiger, but the improvements like Time Machine and all the small things add up. Vista is horrible in comparison when you compare it to XP. Vista has better security, but there's no point to it if you can't use it (I've heard this from friends who are Windows users). Leopard has a few helpful improvements and I really don't see any huge disappointments. I use an Intel Mac, and since Leopard was scripted to run better on the Intel architecture, I end up getting better performance.
Though honestly, I can't compare it as well to Vista since I do not use it. Trust me, I'm not one who's citing junk
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-BMF