I can say thast unless you are super sensitive to a display then you won't notice any difference , just remember that were're talking about mili-seconds.
I had a Lg 27" monitor that had a 2 ms response time and when I decided to go for the 30" display all I could find was 7 ms and higher , so because I wanted the 2560x1600 resolution and the 30" screen I went with the monitor with the 7 ms and I have not noticed anything. The only thing I do notice is the better picture because of the 2560x1600 and I average 175 fps in Call of Duty Black Opps.