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He says that Vista has proven more robust and less problematical than any previous Windows system, particularly when it comes to recognizing hardware.
One of the issues with Vista is that the device driver interface has changed yet again, and vista-native drivers need to be written again from scratch by all of the hardware vendors. Vista might be good at *recognizing* hardware, but its available palette of vista-native device drivers is much smaller for now. In other words, you'll find a lot more device drivers out there for XP than for Vista.
Since you're upgrading everything, though, this won't be an issue as long as you and your engineer make sure to buy devices that have vista-native drivers already.