A friend of mine got through DSE in the second list last year but chose to remain in IGIDR - her classes had already begun by then apparently and she liked the institute. I have received feedback that DSE has become very crowded - the number of seats have gone up and backlogs, repeats are quite high in number - about 48 people are repeating the year and 76 have a back in ecotrix internals. So yeah, lot of study pressure as internals account for 50% of final score, with no scope to improve your grades. Plus you have to pass the exams to sit for placements - kyunki back toh next sem main clear karna hai- by then companies come for internships. So PPO ka scope gaya if you have a back.
As for approaching professors, some are helpful but most are very busy and tutorials main you will get help from the PHD and MPhil people- thats what i have heard of. For research, one needs a close interaction with the faculty and DSE main it becomes harder cuz you are too busy trying to survive. On the other hand, JNU and IGIDR would be better options if your interests are wider.
“Operator! Give me the number for 911!”