Seems like a decent price due to the specs although I don't know much about QSM. Similar specs to the Samsung Viewfinity QLED so maybe uses the same panels?
QSM Quantum Sphere Monitor - Panel Size: 49" - Panel Type: VA QLED - Resolution: 5K DQHD 5120x1440 - Aspect Ratio: Ultra-Wide 32:9 - Refresh Rate: 120Hz - Response Time: 6ms - Brightness: 400 cd/m2 - Contrast Ratio: 4000:1 - Colours: 16.7M - Speakers: 8O/2W - I/O: 2x HDMI 2.0, 2x DisplayPort 1.4, Audio Out, USB-A 2.0 - Ergonomics: Tilt, Height, Swivel - VESA: 75x75mm - AMD FreeSync Premium Pro, G-Sync Compatible, Ultrawide Curved R1800 Panel, HDR400 - Q49CHQB.120-DQHD - 3 Years Limited Warranty
They also claim to have high fidelity speakers if monitor speakers are important to you.
1800r a bit low for that size IMHO