How do the Impulse Triggers feel?

Games Halo 5: Guardians
1

Tried searching for comments on this and I couldn’t find anything current.
Impulse triggers sounded like such a cool gimmick, but I have not played any games where they feel separate and distinct from the controller rumble.
How do they feel in Halo 5?

2

Usually I notice them, but I remember nothing except the end of a reload cycle triggering them. I’m sure the guns firing use them, but like I said.