My results: (Tested on two systems)
No stability issues with them, didnt have any porblems with the nv4_disp infinite loop bug.
All my games ran fine, as did the benchmarks.
All of my gaming benchmarks were very similar to my results with the 21.10's, the few minor differences were within the margin of error.
BUT... 2D performance STINKS!
Alpha blending performance is less then half that of the 27.10's, window layering half the speed, 2D blitting, scaling etc.
Any 2D benchmark I run performance has dropped considerably.
Tried it on another system too, same results. I'd love to know what they did to drop the 2D performance so much.
Going back to the 27.10's they run fine as well, and they don't display the crappy 2D performance.
Admittedly very few things stress 2D performance nowadays... but I'd like to have the performance for when I need it.
Another thread about the new drivers, with another person noticing the very poor 2D performance.