I'm a TA in a junior school. I'm currently in a year 5 class. On the whole, it's pretty satisfying.
However...
the pay is dreadful and we are expected to do more and more for less and less.
there's no induction as such. And you are very much a commodity. You might find yourself starting your new TA job on the Monday, receive zero induction and then be covering the class in the teacher's absence by Wednesday.
as more schools are "onboarded" by academies, everything becomes more corporate and restrictive and you may find yourself using nonsense words like "onboarded"!
behaviour is getting ridiculous and it's frustrating when you've just been sworn at by a child and you see them living their best life, ankle deep in Lego in the head's office.
The plus points are that there are so many absolutely wonderful children who want to learn and if experience a "lightbulb moment", you will be on a high for hours. You will end up with a box full of drawings, notes, craft projects and cards from the children that will bring you so much joy. Not a day goes by without a child making me laugh and you may very well be an important constant in the life of child you desperately needs you.