Got this monitor today. I just love it! Looks great, very nice image quality.
I connected my Hackintosh with DisplayPort, and my iMac through Thunderbolt to the display. I have the mouse/keyboard connected to the screen, and the "USB IN" connected to the Hackintosh. That way I control the hackintosh when viewing the DP input, and when I switch to Thunderbolt, the mouse and keyboard follow and gets connected to the iMac. Brilliantly simple and effective to work with.
After trying some movies, gaming and such I really don't have any complaints at all. If I have to think of something, it's that I have my desk in the middle of the room, and even though the backside of the monitor looks good, it doesn't with a heap of cables connected, looks quite messy. Although 99% of people will probably have it against a wall, so that's no issue for most people. Also, it's very cramped with both this monitor and an iMac on my desk, I will definitely have to get a new desk or move some furniture around soon