If around 110km/h and below, no issue. Just tried up to 140km/h along Kesas highway between Klang and PJ and it doesn't feel too stable and a little floaty, so I brought the speed back down to 100km/h. The stretch of highway along Kesas near Shah Alam is not even and undulating but still that is no excuse for the floaty feeling of the vehicle. Due to the light weight of the vehicle, it's not very stable at high speeds up to say 130 or 140km/h but if around 110km/h it should be fine.

For city driving it's quite perfect due to the light steering(easy to manoeuvre) and low petrol consumption. For highways, no issue at legal speed limits but floaty feeling at higher speeds.