[oldmansan]

Runflats use extrmely stiff reinforced sidewalls in order to try to support the tire in the event of a loss of air pressure. This makes them heavy and stiff. If the suspension is designed and tuned for them some cars do a decent job of handling them, but in general it's a bad idea to out them on something that didn't originally come with them. Especially any sort of performance car as they're likely to affect ride, handling, acceleration, and braking.

I'd skip them for the Evora.

Hard to improve on this explanation.

San