I treat Driver updates the same way i treat Bios updates for my motherboard.
The rule is that unless it will fix a specific problem i am having, or it brings a new feature that i feel would benefit me then i leave it well alone.
Both updates usually dont cause any issues, but they can do and i for one dont feel the need to put a perfectly stable system that is running all i want it to perfectly well at risk for the sake of a few FPS.
I have spent days in the past swapping and tweaking various drivers in search of either FPS or image quality, sometimes with startling results, but always with a reason, never just because its there.
Mactronix