I just bought one and tried it with both my iMac and MacBook Pro (both new systems running Sierra 10.12.6) and... FAIL. It is blurry and for sure will cause eye strain. It's going back to Dell. Dell does not make Mac drivers for this monitor (and I think for any of their other monitors for that matter). Their tech agent said that 'plug & play' is the only option when connecting to a Mac. The Dell software to arrange the monitor into a 4-in-1 works only with Windows and is not downloadable for Mac. I"m sure the resolution would be very clear when connected to a Windows system with the drivers from Dell, but for Mac, does not work unfortunately. It is a 4K monitor but will only provide a max of 2K with with a Mac system (verified with both my iMac & MacBook Pro). A few more calls to Apple and to Dell tech support confirmed I'm out of luck. Calling the Dell return line..
>>>> Anyone reading this post, if you are aware of large sized monitors that have Mac drivers I would appreciate a reply.