Nothing was wrong with it, but it was too damn expensive for what it was. Cams alone cost £800 then you have the extra labour (on top of what you pay for changing the belts) and mapping so all in it's more than a grand and that is if you are doing the belts at the same time.
It's been said before, the torque difference is not day and night, the character of the engine remains the same (power further up the rev range where the clio doesn't actually need) and tbh if you compare two cars in real life, one with cams and one without, you won't be able to tell 1k worth of difference! Sometimes you can't even tell at all...
For me, it just wasn't worth it. Maybe a future itb kit is going to compliment these 'fast road' cams? We are yet to find out..