I bought the AF90+ after having a rather poor experience with a similar Samsung monitor. The Viewsonic was priced right and is a great value for the money. The color is bright and rich and the controls are intuitive. The UltraBrite mode is a great addition and is a nice tool for gamers. When you are deep in a dungeon or some other dark place, with a push of a button you can brighten things substantially.
For a value-priced 19" flat monitor I don't think you could do much better than this.