I find I need at least 80Hz refresh rate on anything otherwise the flickering really annoys me...not when I'm looking directly at the screen, but it really bugs my peripheral vision and gives me headaches. I'm pushing to get my big monitor at work replaced with a flat screen for health reasons :-)
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock