It is a good thing, but not for the reasons they said.
Refreshing the panel at 120Hz isn't going to improve rapid motion over a 60Hz refresh when displaying any current video content, as the video signal itself is only updating motion at 60Hz.
The real benefit of 120Hz refesh is that it is both an even multiple of 60Hz (times two--for smoothly displaying video content, which is updated at 60 fields-per-second/30 Frames-per-second) *and* an even multiple of 24Hz (times five--for smoothly displaying movie content which is updated at 24 Frames-per-second).
120Hz refresh with 5:5 pull-down eliminates the juddering that occurs when displaying 24Fps on a 60Hz refresh display without the need to change refresh rates.
