I have two screens: an old Samsung TN panel Syncmaster 943 that states it has a 5ms response time and a newer LG IPS panel Flatron IPS234 that states it has a 5ms response time (it's also a pretty cheap buy, so, suggestion, suggestion).
I have VERY CLEAR ghosting and whatnot on the TN 5ms, and none of it on the IPS 5ms. It might come down to how good the screen actually is, but if I had to say, I'd say my IPS has a faster response time than the TN, despite both stating the same response time.
So, there, my experience.
I don't doubt Astrallite, technically it's probably true, but as a gamer and a competitive gamer at that, my new IPS is miles ahead of my old TN. Worlds apart. It blows the other into the middle of the last decade.