Cant comment on how good they are but personally I think they look terrible.
They don't seem particularly cheap and the good ones need the tyre removed to fit as far as I know, so that's an extra cost to fit.
I reckon if they get kerbed they will look worse than a kerbed wheel and then there is the cost to get new ones.
Probably better off being more careful and if the worst happens just get the wheel refurbed.