Displaycalgui does indeed work with my I1pro, but I am having real difficulties with it. One of my monitors is a NEC with Spectravision software, basically plug in I1pro, set your target and the display calibrates itself, works great. I want to calibrate my second display to match the NEC, but when I profile the NEC using displaycalgui, it says my NEC is far from the intended 6500k, 2.2 gamma, srgb target.
I have the two monitors adjusted very closely now, but I did by eyeball.