I have one and find it intolerably bright; maybe I'll get it sorted when I actually have a spare evening to profile it ;)
Have been using the 24 inch Dell with the following settings.
Brightness 36 (Dim room setting)
Black Luminance .25cd/m2
White Luminance 165.19 cd/m2
Let me know what your settings are once it is setup. Using the Monaco Optix XR Pro for calibration.