It's a very long journey. It takes 28 hours approximately to reach our destination. Generally, the train won't run late. The seats were in a good condition. But the problem here is, the train will always be packed, especially the sleeper class. All the ticket holders of general class occupy seats in sleeper class. This makes the journey a bit uncomfortable. It is better to book a AC class.
The journey would be peaceful and you could see many scenic places in your journey. If you go with friends or family, you can enjoy a lot.