personally: only second-hand info about reddragon keyboards.
The pricepoint is low, don’t expect premium experience. It’ll do keyboard stuff just fine, most likely.
Also, apparently the customization app doesn’t work at all on linux, even through wine. EDIT: openrgb does support some reddragon models, but only mice. openrgb.org/devices_0.9.html?search=red+dragon - but, keyboard support might happen?