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It's a great monitor since I own two of them. The real issue is not on the contrast side; rather, you may have to swap a few to get one that has evenly illuminated surface without any light bleeds. The other handicap is what you can achieve in calibration is also limited. If you run Windows 8, Asus hasn't released its Windows 8 drivers yet so you can't get accurate colors.
If you need to follow some professional reviews, here is a good one:
By driver, do you mean the generic inf and icm files associated with the monitor? If so, you can extract those from the Win7 package and point your device manager to the inf file yourself. If you are going to calibrate and profile the monitor with a colorimeter why would you need those anyway and how would it limit the calibration? Does the monitor offer hardware profiling or do do the profiles have to be implemented via software (graphics card LUT)?