We've got a Cintiq at our offices and we have had no problems
calibrating our display with the GretagMacbeth Eye One Display2,
Spyder2Pro, or the Optix.
We have a few tips in calibrating though.
1. Don't adjust the contrast, only adjust the brightness to achieve
the correct luminance
2. If you use the RGB adjustments to alter the white point, then
don't change any of the values above 50. e.g. If red shows low, but
you are at 50 already, put green and blue down.
Hope this helps