Hei Snaques
Another Finn, welcome!
Interesting. So Tomshardware claims IPS-panels are not so good at gaming.. Well usually I like and mostly trust what Tomshardware writes, but now I have doubts.
Of course I can't say much about the Iiyama E481S-B, I haven't tried it. But as it uses the same panel as Nec 1960nxi and my Lacie -and having read this thread you know this- I say it is just fine for gaming. My Lacie is so Iiyama should be too.
I haven't yet done any real game testing, will do some later with a new computer. But I tried Doom 3. Only way I can see any blurring/ghosting with it is to spin/turn around as fast as I can in the game. If I keep doing this I notice I slight softening in visuals. But really, it is nothing you will notice unless you start looking for it. And movies, even fast ones, don't show any afterglow. Movies and TV look beautiful and in my opinion it easily beats a CRT.
Understand I can only speak for my Lacie and of course it is just my opinion - very subjective. Still I think your Iiyama should be okay. Can you by the way tell me what you paid for it? With shipping costs, tax and all? I'm curious because the best price I could find for it here in Finland was 605 euros.