Really easy to use. But make sure it is compatible with your hardware. It is compatible with a very wide range of sensors, including non-NEC ones. But it is only compatible with a small portion of high-end NEC monitors. For example, I can't use it with my Dell laptop.
This software is great for calibrating NEC monitors. Works with many sensors, including my original Eye One. Support from NEC is also excellent.
The software does not support calibrating some other monitors, like my Imac monitor,so best bought if you have an NEC monitor.