Well, I bought an Iiyama about 6-7 years, and I've only just replaced it with a new one, and that was just cos it was too small (17"), the display on it was still perfect.
I've replaced it with the 24" Iiyama, and at first I thought it was going to burn my eyes out, but after fiddling with the brightness a lot, it's all good now, and I think it's very nice.
Just got a Iiyama 24inch from PCS. I'm impressed although having never had one before I have no comparison. They always seem to get good solid reviews though.