Question for all 197/200 owners on coilovers

I'm thinking of getting coilovers for my 200 because I can't stand the arch gap, is it worth the money? What's the day to day ride like? I find my 200 quiet firm as it is (I've got cup chassis) will it be alot stiffer? Also what does it do for the handling of the car becuase I assume renault have spent quiet abit of money and time gettin there suspension set up perfect so I can't see it getting much better becuase I doubt the coilovers producers have spent that amount of time and money on making there's just right. So just pros and cons please

Thanks
lynden