well my monitor is always at 60hz and I find it really ok, I don,t see anything wrong with it, but reading this thread, I tried to put to 85hx (which is the maximum my monitor support) and at first, i had so much trouble to clearing see thing, my eye really wasn't used to this, but after 1-2 days it was ok. But I change back to 60hz mainly because my monitor is kind of old and after 2-3 days of being in 85hz it started to do a really shrill(?) sound, it was unbearable and I found out that it was the 85hz that caused this, so I turn it down. And yes when I turn it down to 60hz again I notice the difference, but for me it doesn't change anything >.>