Why Re the diamond cuts a pain?
Damage a diamond cut alloy (even the smallest nick or kerbing) and it can only be repaired on a lathe in a workshop. Unless you have a spare wheel, the car will be off the road for 4-5 days.
Painted alloys, like the ones here, can (usually) be repaired within an hour on the roadside by a man in a van and cost up to half what a diamond cut alloy costs to refurb.
Moreover, you can only refurb a diamond cut alloy 2 or 3 times, as they skim about 3mm off the wheel, each refurb. The refurbishers told me that owners with diamond cut alloys are more often than not getting them powder coated after the first refurb.
I will never buy another car with diamond cut alloys.