Throttle Body Spacers

I was wondering if anyone has purchased a throttle body spacer, and if so, do you notice any gains? Is the bang for the buck trade-off worth it?

they dont work

mass airflow sensor

throttle body spacer i doubt would be much of a gain, i more see it like the tornado, if you have some money, go for the mas airflow sensor, i changed mine and i felt a difference in throttle response.. just made it feel a bit more crispy.... it could all be in my head, but then again.