Did you try (and fail?) using the software that shipped with the EyeOne Display-2?
Sort of. I tried the software packaged w/ the i1 and while it was better the monitor was still far too bright. I found that images posted online were too dark when viewed on other properly calibrated monitors. However, I did not try making any prints based off the profile created by the i1 software.
On a different note, I just spoke with Apple and they claim the brightness issue has been resolved in the new line of LED backlit iMacs. If that is true, the ColorEyes software won't be necessary to achieve a properly calibrated monitor using the software packaged with whatever calibration hardware you choose.