Good? Good doesnt come close. AWESOME for modifications. From what Ive seen as long as you dont change the cc of your engine or fit a turbo/supercharger/throttle bodies, you can have any mods, roll cgaes, coilovers, etc etc and pay no additional premium.
Also - when you buy insurance from them it comes with European Fully Comp Cover as well which means you have no excuse not to go on ClioSport events abroad.
Top people, very friendly.