The driver is definitely faster than 78.01 for me. (i'm single core 3200+ socket A & 6800GT).
However it does share some annoying properties with 78.01, both drivers let me overclock the core less than is normal for my card, and both drivers cause triangle artifacts on the sea serpent in 3dmark05 and weidness (blacked out luna) in the last part of the Luna demo.
The trend of slower running FX era demos continues also - whatevr nVidia is doing in the 80 series drivers appears to impact the performance of early Cg programs.
Back to 81.84 for me.
EDIT: on the 3dmark05 performance, I found it to be quite good, the animation is much smoother, which would suggest nVidia is working on their vertex shader performance. The final fantasy bechmark also animates more smoothly.