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Lookin' good. I think I'll let my little guinea pigs run in the wheel a little while longer though... 
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Well look's like you missed out on your bonus HDD corruption. I've been playing around with them testing them out for about an hour now.... no real problems.
I noticed a very incremental improvement in visual quality in DirectX applications.... small enough that one would need to take a screen shot and compare side by side to really notice anything though. Still, it's nice.
Shockingly enough, I've had no issues with the ever annoying nv4_disp infinite loop bug at all.... if it hasnt shown up this far then I doubt it will.
These are the only Det4's besides the 21.81 that I havent encountered the infinite loop bug. (21.83's were quite good also though)
I got a small performance drop all around in both DirectX and OpenGL applications without FSAA... but it's only about 2% so I don't really care.
I did actually get an equally small performance
gain in 4X FSAA though, with no performance difference at all with 2X FSAA.
I havent noticed any compatibility issues thus far, but I've only tested a handful of applications.
As soon as I installed the new drivers NVMax stopped having any effect though. GeForce Tweak Utility stopped working too.
Luckily I managed to get NVMax 4.0 Alpha to work after reinstalling it.
Overall I'm happy with them, I think I'll be sticking with the 27.10's unless I start running into any compatibility issues with them.
Hopefully others will be as lucky as I've been with these drivers in respect to the lack of the infinite loop bug.