>>105778816
I think it's worth buying once (just once) and returning it if you get the faulty model.
DisplayPort refresh rate @ 10-bit color mode is capped at 120Hz btw (DP1.2)

Share links to the video review and RTings notice to Best Buy if they're trying to bullshit you out of a refund.
https://www.rtings.com/monitor/reviews/aoc/q27g40xmn#test_1387