Medium-sized 4K monitors have thankfully dropped in price a little since they first hit the scene, dipping below £300 (around $400/AU$520) – a price point that makes them competitive with ultra-wide 21:9 monitors.

The AOC U2879VF is up there with the cheapest 4K 28-inch monitors in the UK right now, with a price of less than £220 at Amazon.

At that price and given our past experience with first-generation 4K monitors of that size, we’d expect a few corners to be cut to bring the price down.
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https://www.techradar.com/reviews/pc-mac/peripherals/aoc-u2879vf-1325886/review