Q. Is this bike is comfortable for city rides and highway riders with pillion ? plzz suggest me which bike is comfortable, which bike has good suspension set up? In my mind I have two bikes one is cbr250r and another is DOMINAR 400 . but I think NS will give me better mileage than these bikes. so please suggest me which one should I go for. (I m not going to buy CBR 250r new bike.)

NS is much cheaper than both of your options. Provides good mileage and enough grunt. Both City and highway travel are pretty comfortable on NS. Highway cruise speed normally is between 90 and 110 kmph which good but yes if you can go beyond it can also cruise at 125 and 130. Both the speed bands are good for highway. But if the pillion rider is heavy then the mileage drops to 20-25 kmpl. That can be a bit of disadvantage.

Yep you can maintain that showed band. It's the speed above 120 which is hard to maintain. When you hit an inclination and your speed is above 120, the speed decreases gradually. But when you are in a flat road maintaining 130 is also not a big task.

Dominar is a better bike but I must warn it is better on highway than slow astop and go in city traffic