Amazon is filled with Kodi boxes that have similar hardware specs for less than half the price.
Indeed, but quality has its price...
WeTek is known brand all over Europe and "spreading" to the US, with impeccable support and warranty service, these kodi boxes doesn't have neither.
Also WeTek has all the licences ( DTS, Dolby, Google widevine, microsoft Playready, HDCP, netflix ) these kodi boxes does not.
And as
osu1991 pointed out almost of them will have problems playing 4k content, and end up having poor Wi-Fi / connections.
There are a few brands that could be compared with WeTek, but the china kodi boxes, are not one of them...