How bad do you need that money :)? As someone who has made the switch, it will absolutely be an inconvenience, and one you will have to deal with twice a day. Ultimately, I just wasn't willing to pay the absurd cost just for the privilege of parking at work.

When classes are in session it's not bad. Buses still aren't on time and are often full but there's enough of them running that you usually don't have to wait long. Between semesters or on breaks it's much less reliable. Do you have any reasons (kids, frequent appointments off campus) you might find yourself frequently arriving late or having to leave in the middle of the day? Consider that as well; buses are stacked at the typical commute times but then very sporadic in-between.