After reading a lot of forums, these drivers appear to do the following:
-increase 3dmark scores in most high end systems by up to 10% most notably in the nature test
-sometimes increase fps with high end cards in high quality settings with a few games
-sometimes with some games increase AA peformance of high end cards
-in most games on high end cards increase 8x AF performance considerably
-sometimes reduce performance slightly in a few games on various systems
-in most games on most systems performance change stays within 1%
-generally reduce image quality in most games
-disable bi/trilinear filtiring at default settings
-in a few cases reduce image quality so much that games become unplayable
-generally reduce AA quality in most games
-make 4x and 8x AF quality settings indistinguishable (they look the same)
-change the control panel and add options
-sometimes fix and sometimes create refresh rate issues
Summary: drivers do increase performance on high end systems/cards in a few situations, most noticably in 3dmark. Performance increase in games in general is quite rare and sometimes the performance is even reduced. In general, performance in most games and most situations is about the same. Image quality is lowered quite a bit in a lot of games, same goes for AA quality.
Forums i've checked: arstechnica, rag3d, overcockers.com, hardocp, beyond3d and tweakers.net, nvnews.
PS - sorry maar ik had geen zin om dit allemaal te gaan lopen vertalen