I'm thinking a Diamond line might be the perfect time to transition to the magnetically attached grills used in the Luna. And at that price point, perhaps even hidden fasteners for the drivers. Hidden fasteners would make self-service or upgrades more difficult but, really, what are the odds of an upgrade from the Diamond? Just imagine the super clean look of a Sierra Diamond with no visible screw heads or grill mounting points - it would be as stunning visually as it is audibly! I keep the grills on my RAALs to keep dust and dog hair out but I'd be less concerned about that with the Diamonds and would certainly want to show them off.