I have had these Alloygators ( alloygator.com.au ) on our Astra since 2017 and not had any problems with them at all. (mind you we have only done 9000 km). I am in Brisbane Australia but I'm sure you would get the product elsewhere. Although we have not had the misfortune of curbing yet, it does give me peace of mind knowing something is between the pristine rims and the harsh cement.
Cheers from Oz😀