Most of the time, this train reaches Ahmedabad on time, its speed is decent, in the Ajmer-Ahmedabad section. This train gets its max speed in the Bayavar-Marwar section (estimated 100 km/h), it skips Sojat and Chandawal at a very high speed. During the winter months, this train often gets delayed in reaching Ahmedabad on time.

If you wanna go from Ajmer/Bhavnagar to Ahmedabad/Mumbai, this train is a better option. Most of the tickets get confirmed on this train. PQWL also gets confirmed many times. It's better to book the reservation from Agra Fort for a confirmed ticket. There are good chances of getting a confirmed ticket in GN quota in Kota. There is a lot of crowd from Ajmer/Bhavnagar to Ahmedabad/Mumbai in the 12990 Ajmer Dadar Express. If the ticket doesn't get confirmed RAC on 12990, then this train is a great option. With this train, you can reach Ahmedabad by 13:40, and then catch the 12010 Mumbai Shatabdi, which departs from Ahmedabad at 14:40. Shatabdi usually gets confirmed tickets. So, in this way, you can complete the journey to Mumbai in just one day. In winters, this train often reaches Ahmedabad late, many times. (My personal experience of traveling)

You can chill and sit comfortably without anyone beefing about sitting in your spot... Number of seats in a coach=Number of people on the ride.