Anyone that buys on specifications seems to get burned.

As to Hz, the teen to 20 something fighter pilot might be able to tell but after that, 60 is fine.

Item 3 is math. LCD switches a cell on fast and the cell needs to turn about half off in at the refresh rate to avoid ghosting. So do the math of 1/60 = how many mS? And the number you get is then usually that or about half that.
Bob