Hmm several of my friends have this monitor have had several complaints.
The two main one are first, the monitor needs a "warmup" period of like 30 minutes where it finally activates the preset correct geometry settings. Before that time, your screen might be smaller or it might be off a bit becuse the monitor is using it's default settings.
The second problem is related to the first problem. Everytime my friends exit out of games, and switch between different resolutions, the monior has problem adjusting and so when they exit out of a game, their screen is off a bit and they have to constantly change the monitor settings.