hi i own an 06 iDSI and 2010 iVTEC City
let me just say that the New City is better than iDSI city in everyway
suspension stiffness seems to be the same as far as i can tell but we dont go to rural areas and both cars r used in Karachi only
New City retains the excellent Fuel economy of iDSI and adds much more horsepower making it the fastest 1300CC car in Pakistan currenty
The Clutch is like Air
think of the softest clutch u can imagine and ill tell u the new city has a softer clutch that the one u imagined 
Steering is also extremely soft which u have to experience it urself
i dont know about ECU problem but the car used to Knock when it was new
most ppl suggested to use 70% Super and 30% Hi Octane but eventually this problem disappeared
All in all i would say the New city is a worthy successor to the car that redefined Fuel Economy in Pakistan, the iDSI City