Never heard of them.
Looks like they're pretty much exclusively in Scandanavia.
Roughly 40EUR for a mousepad with RGB an a 40EUR mouse.... I wouldn't expect too much from them, but they should be decent enough.
In Denmark, you can buy the bundle with the mouse, mousepad and a headset for 600 Krone / 80EUR total.
https://www.coolshop.dk/produkt/don-one-gaming-bundle/AM6WU9/
Or Swede, 900 Krona / 86EUR total.
https://www.spelbutiken.se/produkt/don-one-gaming-bundle/AM6WU9/
The headset is a ~50EUR item.... Opt for the bundle, sell the headset if you don't need it (30EUR, maybe?) and you get the mouse + RGB mousepad for ~50EUR total.