I see customers with these sub £300 machines. All of them I've had in struggle. Really nasty.
To get them working smoothly you need to slap in a SSD minimum.
I would take a Chromebook over them every time. Quick start and snappy browsing etc.
A cheap Windows laptop needs a proper CPU and a SSD to really compete IMO.
Minimum spend for a new Windows laptop is still £400-£450 for me.