I cannot say anything regarding to the quality of the display, but I do know that a Spyder2 does not correctly work with wide gamut displays. Also I find that the quality of measurements in low RGB-values cannot be considered accurate using the Spyder2. It seems to only measure noise from anything darker than 0.4cd/m2.
This depends on the driver to some degree. In the Argyll driver I've attempted to improve the low light performance by integrating over a longer time period. Off hand I'm not sure how this compares to the manufacturers drivers. Graeme Gill.