I travels in Shatabdi for two times and it is much better than the other trains, the coaches are large and comfortable, and you will find passengers descent and helping which you will not find in ordinary trains. The catering service is also good from the train point of view, if you are looking for time saving then this train is for you, after Rajdhani express(I liked it little more after experiencing) because it will stops only on main stations, and it will cover the distance after getting late because of any reason, the railway gives it priority and passes it first then other trains in case of passing from the same track., so I think everyone must experience it at least once.