Good contrast, brightness, viewing angle, thin edges, much less backlight bleed than my old IPS. The colors feel a bit faded, but it's probably just because my old one was översaturerad and had lower brightness. IPS Glow is visible at the bottom right if you show dark things, that is what draws it down to a 9 instead of 10: a.
A little too blurry when driving in the default sharpness, 70 funker more to my taste. Have you higher so it will be a little artifacts. A bit light, driving one of 6500K, however, so it is pleasant. Unfortunately, I would say that U2412M is a bit more beautiful picture. Hard to put your finger on what exactly, U2415 is, however, better looking and with its thin edge better if you have multiple displays.
Good color reproduction and viewing angles. No problems with backlogs at stake. Slim design. Good adjustment possible units, feels solid built.