I use two Dell P991 monitors, and they started out great, but have begun to go "green" on me (I know, you're thinking "green", WT-!?!?). I can't explain it, but when I play tac-ops on my home one, it has a colder, greener look to it vs. the Sony E400 that sits right next to it. It's wierd, and I know it hasn't always been like that. I'm not saying not to buy it, but I am giving you my experience.
Since they are both from work, I can't RMA them either. That's up to the IT dept., who prolly has better things to do....