I used the MS drivers previously but at the time I never checked with Plextools to see how it looked. Basically, I never noticed.
The problem with the MS drivers is that they are essentially old nVidia drivers. They are authored by nVidia anyway, but they are just old. The genuine nVidia drivers are much better in terms of disk throughput, lower CPU utilization etc. So I prefer to use them.
There was a time when the nVidia drivers caused problems with some CD and DVD writers, so lots of people prefered to stay with the MS drivers. But as far as I can tell that time has passed - the nVidia drivers are just plain better.
BTW - I have tried different nVidia driver versions and none of them make any difference.
I could try swapping back to test the MS drivers, but to be honest I really don't want to go messing with my (perfecly working) system like that, just to prove a silly point. Like I said, the Plextools "problem" is only mildy annoying and it really doesn't matter at all.
If anyone is using nForce3 with MS drivers and a PX716 though - it would be interesting to see how things look in Plextools.