My opinion - - If money is not an issue, then join it. Worst that could happen is networking and something on your transcript. Outside of that, I think it's a waste of time unless you want to be involved in a student group.
To me, it's not worth joining because it's not very prestigious. Everyone who tried hard for the first quarter could easily get a 3.5. Someone who took 3 GEs and got even A- average could get in. Save your money for honor societies within your department or Golden Key when you get a chance to join those.