Summary: Not completely compatible with iMac "Mavericks" update. The horizontal or landscape mode was O.K., however the vertical or portrait mode drew one of those typically inscrutable popups which indicated that the iMac hadn't been programmed for the portrait mode, with, of course no information as to how that should be done. It's apparently a question of mixing Apples and......, sorry, Samsung's "orange".
Summary: The monitor worked great for a couple days. It looked great on the desk and set up easily. Unfortunately after a few days of normal usage, a thin, vertical blue line appeared on the screen and would not go away. Some research revealed that the Blue Line of Death was probably a series of dead/stuck pixels, but I'm new to the world of monitors so I'm not completely positive. But the consensus was this problem usually only shows up if the screen is defective.
Summary: The monitor that arrived was completely defective. About 1/4 of the screen displayed an image correctly, the rest was a series of lines and colors. However, the return policy and service by Amazon was excellent. This was the second Samsung monitor I've had. The first died after about 1.5 years and this one was defective right out of the box. Not a great recommendation for Samsung. I am now using HP monitors.