The X-Rite i1 Display Pro and the NEC branded version are the same.
The one advantage to buying the X-Rite colorimeter is that you will also have access to the X-Rite software to calibrate any Non-NEC displays. Specraview can be purchased as a download directly from the NEC site. Maybe Spectraview can calibrate an iMac, but I'm not sure.
I thought the NEC branded version has special filters installed specifically to give better results on NEC monitors? So, they are not the same, exactly.
Can anybody comment on the importance of these filters?