Well it would be there on a 60hz, but much harder to see. Firstly because vsyced 60fps is much easier for me to attain than 120fps, and secondly because it'd be hidden in the blur as compared to a monitor running 120hz.
Even without judder, just the 60fps with doubled frames on a 120hz may be less enjoyable than single frames on a 60hz.
But then, these things can run 60hz anyway, right? Not too hard to switch modes? And turn lightboost off? I suppose I could just get one and enjoy the benefit on the games than can run that well and turn it off if it's problematic on other games, like MMOs that lose framerate just off connectivity issues.
Then again, I would be intentionally throwing away the opportunity to have delicious color and contrast at all times in order to get nice motion sometimes... Fuck, I wish I wasn't being rushed into this by my dying monitor.
Edit:
This is my monitor, which I didn't realize I got 4 1/2 years ago. It claims to have 2ms GTG so if that's true, maybe an IPS would be like death to me, since this seems blurry as fuck. I guess I should just go with the Asus or something,