I didn't know Drevo manufactured their own MX clone, but they are far from the first. MX clones are made by Gateron, Kailh/Kailua, Outemu, Greetech, Razer, probably companies no one has heard of because there are unmarked switches out there too. Clones are not known to be any worse, and in some cases they are better, such as Gaterons often observed as being less scratchy. Don't fret it.