No issues since overclocking almost an year ago. Maybe a slight decrease in battery life but that might just be the higher fps in games or my aging switch. Also you can set per game overclock profiles inside switch. You get the full UI interface these days so even if by some chance it causes issues you can tweak it without leaving your game!
Looks like generic chinese mechanical keyboards you get in flea markets.
My first mech was very similar, got it for less than 5 bucks and came with kailh blue switches. Body was solid but switches left a lot to be desired.