hah and then I forgot to post my result :D post updated, thanks!
I'm a huge advocate of not using 1000hz as a polling rate (because no mouse can handle the input). As you say it's not a big deal but if you're comparing 500hz to 1000hz, there's only a millisecond of extra input delay and I'd rather sacrifice that extra millisecond of responsiveness (tbh on a 120hz monitor the extra millisecond might actually be surprisingly useful but for my setup it's not) for the sake of consistency in the frequency that the mouse updates its position on my screen. I think input lag is only going to be a significant problem on a mouse which has a 125hz polling rate [EDIT: or if you own a mouse with an 'artificial' polling rate, such as the Roccat Kone or Zowie EC-series mice]. Even if you have a mouse which is locked to 125hz, such as a WMO, you can actually overclock your mouse to poll at 500hz. There's a cool thread about it here.
And I guess it's easier to detect on a 120hz monitor than a 60hz monitor, but I kinda predicted that most people who have played FPS games for a long time would not really have much trouble identifying input lag when they see it anyway. I just wanted to see if I'd get proven wrong :D
I'm a huge advocate of not using 1000hz as a polling rate (because no mouse can handle the input). As you say it's not a big deal but if you're comparing 500hz to 1000hz, there's only a millisecond of extra input delay and I'd rather sacrifice that extra millisecond of responsiveness (tbh on a 120hz monitor the extra millisecond might actually be surprisingly useful but for my setup it's not) for the sake of consistency in the frequency that the mouse updates its position on my screen. I think input lag is only going to be a significant problem on a mouse which has a 125hz polling rate [EDIT: or if you own a mouse with an 'artificial' polling rate, such as the Roccat Kone or Zowie EC-series mice]. Even if you have a mouse which is locked to 125hz, such as a WMO, you can actually overclock your mouse to poll at 500hz. There's a cool thread about it here.
And I guess it's easier to detect on a 120hz monitor than a 60hz monitor, but I kinda predicted that most people who have played FPS games for a long time would not really have much trouble identifying input lag when they see it anyway. I just wanted to see if I'd get proven wrong :D