From a Calman user that swapped to ColourSpace ZRO, in a discussion with another Calman user who has also just started using ColourSpace ZRO:
"It took a while for me to get the hang of using ColourSpace ZRO, but once I did, I've found it to be the best display calibration software I've used so far."The key benefit of ColourSpace is it actually teaches the user about calibration, rather than trying to provide workflows that teach you nothing, as with Calman, as well as providing the ability to generate far more accurate results.
Steve Shaw
Mob Boss at Light Illusion