Armour Fend fitted to my Roadster for £350 or so.
My metallic paint would be difficult/expensive to match, and this was an insurance policy.
Yes, look hard and you can spot the edges, but stone chip protection to cowl, front wings, running boards and front facing rear wings worth it for me.
Of course it would be no defence agains "hammer blows" but does avoid stone chips which make it worthwhile - especially if long trips are planned.
Cheers