I'm a TA in a Secondary school which seems to be a very different role than a primary TA. I did help in DSs school in year 4/5/6 before getting the high school job though.
I did a huge career swap last year to do this & although the pay is poor, its a nice job (when the kids behave!). Every day is different, the kids have a huge range of 'issues' and its good finding soemthing that works for that child & feeling that you are actually doing something to support the child in learning something. (Big kids are a bit scary though )