This is a relatively short review, I do not have time to make pictures now but I need to get the word out: U2715H is an almost decent monitor. It has a native resolution of 2560x1440 (QHD; 16:9; 0.231mm pixel pitch), an 8-Bit LG IPS panel (no PLS, no AHVA, just AH) and no LUT (lookup table) AFAIK. The Dell advertises that it practically has "no bezel", but it does albeit a rather small one (1.5-2cm approximately). It features an USB hub, though not sure whether it is 2.0/3.0/3.1. I don't care for those hubs, as they are typically of low quality.
Now onto the really important stuff.
Uniformity
A screen, in my opinion, is useless without good unformity. I was extremely hesitant to buy this monitor, as tftcentral - the gods of dem monitor reviewing game - reports uniformity on their test model was SUPER MEGA BAD. After OCD'ing on reviews on various sites and customer experiences on hardforum, overclock, amazon, prad.de (.e.g, the usual), I decided to pull the trigger.
Uniformity is ok. On my particular unit, white is moderately even. There are two very small bands on the left side and right side of the monitor (5cm wide) that are noticeably darker. For the rest, I cannot see any weird deviations. I also see no COLOR deviations either.
So yeah, this screen has my OCD Uniformity seal approval.
IPS Glow
O MY GOD ITS BAD. But then people say its inherent to the techinque and I should switch to samsung PLS or AU Optronics AHVA. But Samsung and AU quality control is so poor it makes my cringe and cry at the same time. So how bad is IPS glow really? Well.. My previous U2713HM - which btw is also blamed often for poor ips glow - is great. I only see it slightly. If I don't know it's there, I can ALMOST neglect it. With this monitor, the U2715, it's freaking staring me in the face. Insiders will never ask "hey, is this IPS, PLS, or AHVA?" Because they will friggin see it right away. They will say "my eyes bleed. the glow, the horror, why did you buy this thing!" So playing Doom 2016 is like... like you said your gamma way too high and there is nothing you can do about it. If black levels are a great deal to you and you watch a lot of dark scenes.. say the f**k away from this monitor.
Whine, buzzing, noise
Luckily, although some people report it, there is none. I tried every brightness setting in steps from 5 (5..10..15.. etc.) and could not hear it.
Factory calibration
WTF IS THIS YELLOW TINT. So it's factory calibrated and you get a "personalized rapport" that outlines your particular calibration. I don't believe it. This must be wrong. As with previous Dell screens, it never comes out okay. It has the yellow tint. IT IS HORRIBLE. The whole image is yellowish. Gray tints and white... it is piss poor.
Can it be fixed? For my particular panel I could get color accuracy close to my calibrated U2713HM.. I set my display to custom color and set R G B to 93/90/99. YMMV of course. I don't see yellow tint anymore neither in white or on gray levels. I checked both screens side by side for like 2 hours or so and fine tuning it BECAUSE I HAVE SEVERE OCD FOR THESE KIND OF THINGS.
Cross hatching, banding, PWM, sharpness, brightness
Brightness is sick. It is REALLY bright. This is a good thing, as even leds deteriorate over time, although much less than CCFL. Where I have my U2713HM around 40-50%, my U2715H is around 20-30%.
Everything looks REALLY sharp and crisp. I take it that they improved on the light AG coating and this clearly shows. Text is much sharper and contrast is much better.
There is ZERO cross hatching and NO banding. As a matter of fact, gray gradients from 0,0,0 up to 255,255,255 are extremely smooth. I could not detect flaws there.
And.. there is NO PWM so no flickering. YAAY. No eye hurt from this monitor.
Conclusion
The good: no PWM, great sharpness and brightness, good uniformity.
The bad: calibration out of the box is horrible, but it can be fixed by calibrating it yourself manually (setting R G B levels) or using calibration hardware
The really bad: IPS GLOW OH MY GOD.