I think it's very useful society. So, if somebody wanna be successfull, don't think any minute. Just go there!
The professional events are extremely helpful, for both networking and skill development. Both the socials and all of the sports teams are great fun!
I was a keen member in my first 2 years at Exeter. I am currently on my year abroad and I still feel apart of the society! I would recommend to absolutely anyone, perfect way to meet knew people and have a great time doing it.