I don't like the misinformation that goes on this site, just having a lower/stiffer/whatever spring doesn't make a car handle better, it can even make things worse.
Personally i think there isn't much wrong with a standard Cup. I don't think there is anything wrong with the normal 172 either really. The Cup is a bit keener, but then it's also a bit scarier on the limit.
The Eibach is progressive and will alter it's stiffness depending on how hard you push. If you push too hard, you will run of travel and hit the bump stops, at which point the car is in control of you. The standard cars are well damped, and is unlikely to get you into that situation in the first place.
I don't mind the Eibachs, they improve the look, and up to 9/10ths they work. The car grips more, it will go faster, whats not to like? But if you were realy going for it they would come a cropper, and so, in my humble opinion, they don't make the car handle better.
It seems people only go here on what other people say, and you can't rely on some inexperienced Clio owner who compares his product to nothing else! I'n not saying everyone should listen to me, i by no means claim to know everything about suspension, but i do find it annoying that when someone questions what everyone else is saying, you get treated like you're a f**king weirdo!