This is why Apple rocks. 64bit OS and apps with no driver issues. 
Err, no. The reason you find so few driver issues is simply because they have very few devices to support! OSX barely offers any drivers outside of the select few that Apple uses in their boxes. It's still a closed platform.
Vista has to support 1000x the number of devices. It's driver support is vastly superior to that of OSX, but due to the fact that there are just so many different possible devices one can use with it, you're bound to run into more troubles. That said, I've never had a single driver issue with Vista X64. I'd imagine only older devices might have some issues.
If you've ever messed with OSX on non-Apple hardware, you'd see that it barely supports anything. You need very specific hardware. Yes, that's the benefit of a closed platform, but it also demonstrates that Apple had a lot less work cut out for them.
I've had a very good experience with Vista X64 thus far. Nearly every game I've thrown at it has run without a problem. This includes the latest software to games from the mid to late 90s. Very few of them have had any issues. I just installed System Shock 2 again for kicks and had no issues, for instance.
