I know this is not the 24 inch model but I have to say I have blown away with the quality of the monitor, from build to picture, even the speakers are impressive for monitor speakers.
I have not run into any issues, no dead pixels, no random standby's, all perfect so far. There is a little bit of black light bleed with the lights off but not enough to write home about and with the lights on there is zero bleed. Mine is a November build BTW.
Unfortunately, I am unable to test Freesync as I currently have Nvidia pushing this monitor.
I can feel and see the difference from 1GTG to 4GTG in gaming and after an hour of use my eyes seem to have adjusted to the slight delay, however, nothing that would hinder my gaming.
For productivity, as I work on this PC I must be clear that it is fantastic if you work with multiple windows or even PC's because of the screen real estate. I used PIP with a MacBook Pro on the bottom corner of the screen and Windows covering the rest using symless's synergy to use one mouse and keyboard for multiple computers, works perfectly.
Setting aside the issues people have had with Freesync, this is an amazing monitor and would recommend it to anyone and if this monitor does not impress someone then they are asking for a hella lot.
Out of many high-end monitors I have purchased over the years, this is the only one so far I have genuinely been overly impressed by and keeping in mind that I have not adjusted any settings apart from setting response time to 'fastest'.
Gibbo was correct to say how impressive this monitor really is.
...Response time on the ones we have here is absolutely brilliant including the big 34" monster which in short is the best monitor I have ever witnessed.
Edit: I was going to place the monitor on my desk mount arm but the stand on this beast is excellent so I have removed the desk mount completely.