"It promises mansion-sized coverage for a dinner-for-two price, a classic physics-defying claim."
The '15,715 sq.ft. Long Range' claim does not mean it will provide usable internet across a third of an acre. It means in a perfect, radio-silent void, the device can transmit a faint, unusable signal that far; expect it to maybe push a weak signal through one or two additional walls.
This product is for someone needing to extend a WiFi signal to an immediately adjacent room for a single, low-bandwidth device like a smart plug. It is a choice made when name-brand alternatives are unavailable.
Anyone needing reliable coverage for streaming, gaming, or more than a handful of devices should skip this. The price is too high for generic hardware with no support, and superior, honestly-specced extenders from reputable brands exist for less money.