Dell specifies a 3840 x 2160 resolution at 60 Hz on a 27-inch class panel using IPS Black technology, with 400 cd/m² typical brightness and a 2000:1 static contrast ratio. Those numbers are meaningful: 4K at 27 inches delivers dense, crisp UI and type, while IPS Black's main promise is deeper blacks and more separation in dark UI themes than typical IPS.
Digital Camera World describes IPS Black as a real boost to black depth, though not OLED-level. The publication also links the monitor's 400 cd/m² brightness to VESA DisplayHDR 400-class HDR support—helpful for occasional HDR content, but not the same as a true high-dynamic-range experience with strong local dimming.
Color is another clear strength when judged on published targets. Dell lists 100% sRGB, 100% Rec.709, and 98% DCI-P3 coverage, plus 10-bit color producing 1.07 billion colors. Digital Camera World reports that the U2723QE matches Dell's headline gamut claims in practice, and IT Pro calls out very good color accuracy in both sRGB and Display P3 modes.
The trade-off to keep in mind is that wide gamut and creator-friendly do not automatically mean reference-grade for every pipeline. Digital Camera World also notes that AdobeRGB coverage could be better. If your work is primarily sRGB/Rec.709 with occasional P3 deliverables, the published gamut targets line up well.
If your workflow is heavily AdobeRGB-centric, the U2723QE may be less compelling than its P3 numbers suggest. The specification clearly positions this monitor for working standards rather than every possible color space.