I've been using this monitor for two weeks and it's absolutely amazing. My Dell 3008WFP 30" monitor died and this was the replacement. I was thinking that it was going to dwarf my Dell but actually it was lighter and thinner in comparison and it's not so overwhelming as some make it out to be.
There are no dead pixels or flickering. I have been playing the new Call of Duty game and I see no ghosting or anything that impacts my gaming. I have also tried CS:GO and all is great with that too - I am not a professional gamer but i have been playing CS since 1.6 and I found the responsiveness good enough for my own gaming purposes (I also dabbled in some retro games recently like Red Alert but that's not so important for my review, but that worked out well scaling down to a lower resolution too
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Watching films at 4k is incredible, wow, I was blown away at how nice everything looks. It's definitely makes a difference in my eyes over my older Dell at a lower resolution.
Productivity was impressive, the ability to fit multiple Word and Excel documents was fantastic. I also was able to run a lower resolution 2560 x 1600 Citrix connection to my work which allowed me to run multiple windows at the same time on the same screen. Very cool indeed. Adobe Photoshop looked good enough for my own purposes, if you need it for professional reasons on this monitor, I think you should read the TFTCentral review in detail first.
I followed the guide to calibrate the colours on TFTCentral and this really did a great job! The difference before and after applying the profile was very clear to see, I recommend everyone who owns this monitor to adopt the profile provided on that site.
Even though it was clearly stated in this thread how to set the monitor to 60Hz, I really struggled with navigating and setting this up. In the end I managed to do this and all is now working well. You need to have a lot of patience when navigating the menus.
The power indicator light was annoying right at the bottom of the screen, however, the lovely people at Phillips provided thin black strips in the plastic bag which contained the manual. This easily covered the light without causing any negative visible aesthetic change.
I give this monitor a solid 8/10 a definite buy for those looking for a hi-res monitor.