Touch wood, but I haven't scratch a wheel in over 10 years. I paid extra attention to curbs on parallel parking (i.e. 2 feet off the curb) and turning. 

They get chipped by rocks though. Regular wheels are painted so has to repaint. But as far as I know these carbon wheels are protected by a thick layer of urethane, like the diffuser on the underbody of my 918 and that finishing is quite resistance to rock chips. 

Potholes on the other hand are a different matter...........


--