Feelworld provides great budget-friendly monitors. It comes with good features such as focus-peeking, histograms, and so on.
Compared to having no monitor, it's a world of difference to see how your composition is and to recheck your focus (especially as focus-peeking isn't always helpful when you're shooting in low-light).
I do wish that the build quality was a tad bit better. The monitor itself is great, however it feels "cheap". The controls also aren't that great, think of using the controls on an older monitor/TV on the side.
In the end.. this monitor gives great value and so it is worth to buy it.