Been very close to pulling the same trigger myself! One of the best OEM+ wheels for a MK5 ever

They're 8J ET43 IIRC? If you hit a deep enough hole mid corner, they will indeed rub the arch. I've had arch contact from the OEM 7.5J ET51 wheels

You can mitigate the problem with stiffer suspension and/or stiffer ARBs though....and also removing the arch liner screw/tab.