Laser Projectors for Grading - Consensus

[Jean Paul Sneider]

Hi,
As far as I knew, a good calibrated laser projector (like a NC1201L) was absolutely fine for colour grading a film with cinema distribution. Maybe some limitation about pure blacks (more of difference from what I got), but longer calibration consistency over time and frame so more reliable.

Other than that I wasn't aware of major problem with those. 

But just today a person that installs and sets up grading rooms told me he never been able to find a suitable laser projector, good enough for the requirements of a grading room. Despite me pushing for further info he didn't provide details about what was wrong with them.

so:
1) What am I missing?
2) If there are any actual major difference, does it really matter with the shift of more and more cinemas to laser projectors?