After trying a load of 144hz ips screens from other retailers but not being able to get one without terrible backlight bleed I gave up on 144hz IPS and went for the S2716dg from Overclockers.
I thought I had got a perfect panel but then I noticed that when panning across the sky I could see a horizontal band, like a shadow, spanning the screen just a bit above where the crosshair would be. Did a bit of research and discovered it's something people refer to as dirty screen effect. Once I'd noticed it I couldn't unnotice it.
Overclockers fobbed me off and got me to go through Dell for a replacement. Waited for it to arrive and not only had they send me a refurbished model to replace a brand new monitor I hadn't even had for a week, but it had been refurbished with a massive scratch down the screen! I remember thinking as I unboxed it "Hmmm, there's a lot of dust and particles and crap all over this thing" and then I realised those particles were all bits of screen that had been gouged out.
Dell took their crap monitor back and Overclockers agreed to do what they should have done in the first place, what any other retailer would do, take their monitor back and send me another. Unfortunately that one too also exhibits signs of DSE. Fainter, but instead of one prominent horizontal band there's like three faint ones I can see when the camera passes the skyline in games. Not really good enough for such an expensive monitor.
It's really hard to pick up in photos and on camera, especially as the monitor is a light source itself and the autofocus on my phone is crazy. Overclockers have told me it's my gpu or cable acting up despite the fact that I can see these horizontal bands in the monitor's diagnostic mode cycling through to a grey screen with nothing plugged into it at all. Nevermind that the same gpu and cable exhibited no such issues on my 60hz 1440p ips monitor (U2713HM).
Really unhappy with Overclockers' service. First they try to fob me off and send me Dell's way, now after already messing about with deliveries and collections over and over again they want to try telling me its my gpu despite the issue showing up in the diagnostic mode!
I sure don't want to deal with Dell again. Even if they do manage to send me one that hasn't been butchered, I'm not accepting a refurb when I paid for a new one.