I have been complaining about my Samsung 193t in the forum for 19' monitors. I found it unevenly lit and showing strange "pinkish" color. Well I filed at Samsung Service Partner, to have it replaced. At first they replied that they were out of stock on this model, but a few days later a package arrived with a new monitor. Quite allright with me.
I am not sure I have heard the end of the story yet though, since I have realised that the Samsungs in this segment are not top notch. And the new monitor I got did not differ so much from the one I wanted replaced.... (the fine print says you get to pay if there is "nothing wrong" with the monitor you return)
Anyhow, so far service ok!