If you decide to calibrate your iMac Pro screen, you might be disappointed to find out that there is currently a bug in either display firmware, or MacOS High Sierra that automatically re-adjusts the brightness level of the display to 90% brightness after each reboot. There is a temporary fix to prevent this from happening, but it is a nuisance and something Apple should address as soon as possible, especially considering that this is an expensive display that is specifically designed for photography, videography and graphic art needs.
