Nickel and dimed to death.
The person that first came into my classroom to offer to help me set up a 403B ends up being one of the most expensive 403Bs options I have per the website https://www.403bcompare.com/
And then on top of it all my school district employer even charges me a monthly fee of $3 just to send money to my 403B.
Edit: It's actually the 403B admin that is charging me the $3 a month.