Discount tire.com recommends changing the TPMS kit when changing tires. They're $5 each.
I can see why you might change it if you drive in snow and salt. You might get corrosion.
But if you drive moslty dry and city highways, I don't see why they would need replacing. I visualy checked my valve stems and they look fine inside, no corrosion.
Has anyone had any experiences with that?

 

no need its just caps and value stems

 

Unless you are experiencing a leak or swapping your sensors to new wheels, it isn't really necessary.