Really, I think this whole TN vs IPS millisecond debate is a load of ****, and IPS panels are really just overall better. Allow me to explain.
There are 1000ms in one second. A 1ms response time would ideally match 1000 fps, and a 2ms response time would ideally match 500 fps. 3ms would be 333 fps, 4ms would be 250 fps, 5 ms would be 200 fps, 6 ms would be 166 fps, and the highest I've ever seen advertised on a monitor, 10 ms, is still the match to 100 fps.
As most monitors are only 60 hz, with a few rare (and imo, pointless) ones being 120hz or 144hz, it should be physically impossible to see the difference below 6ms on any monitor, or 10ms on most monitors. Any amount of "ghosting" the monitor removes with the high refresh would be tiny compared to the framerate limit itself. On an LCD panel or LED panel, the image is retained until the next frame replaces it, and one the image is replaced the response time comes into play, clearing the previous image and determining how long into the frame there's still an "afterimage". However, your eye reads the framerate and the artificially retained image the same way. At a framerate of 60 or below, the afterimage will be minuscule and far outlasted by the new frame, making additional blur virtually (or perhaps literally) impossible to see if the monitor is accurately advertised.
The people who claim to see a difference from 1ms to 2ms are probably the same ones who claim their $300 HDMI cable improves the [digital] signal quality over a $10 HDMI cable. If you know how digital works, you'll know how inherently ridiculous that claim would be.