I've held off on these for the moment.
Lot of users reporting up and down GPU spikes with Firefox and it's HA, and just idling on desktop introduced by this set. Some on about it bringing back the 59hz and Windows logo flicker bugs back, and higher temps/fans coming on higher frequently also.
The main Nvidia guy had said these were going to be re-released as WHQL in just a few days
, but it sounds as if he's accepted some of these bugs and they're going to work on them - hopefully.