We started as a student prime member when I went back to get another degree 20 years after the previous. At the time, I mainly wanted it for the textbook discount which made it worthwhile. We upgraded to regular prime before I graduated because it had better benefits for us. I am now contemplating my 4th degree and would like to have some of the student benefits added to regular prime. We did annual with both the student and regular primes.
Love Prime! Money is tight, but I do without other things to have it.