If I was you, go to your local big computer shop and try to find either the same model or ones with similar specification to compare.
A lot of it is marketing spiel. I see monitors all the time that say fastest 2ms refresh - never see blur again e.t.c. - I am using a 7 year old NEC monitor (1880SX) that has a refresh rate of 33ms and a contrast of (I think) 250:1, at its time, it was also rated as "never see motion blur again!" - I think it is brilliant and would not change it for the world.
I have a second monitor that is newer, MUCH higher specifications, however you would think it is older when you look at picture quality (however, it is still not bad!)
Also, shockingly, Manufacturers lie! even if one has a higher rating than another, it may have been under a special condition that you would never be able to repeat. The only real way to compare is to buy it, or look at the model and see!