I'm using a Sony G400 (19") at 1600x1200@85Hz. I would say I can spot
flicker a mile off, I can tell you the difference between 75Hz and 72Hz, the
lighting has to be just right (just wrong?) to be able to see any flicker at
80Hz and I really have to look. I have never noticed any flicker whatsoever
at 85Hz, it's absolutely rock solid.