Sort of the same as an impact screw driver - virtually no torque reaction fed back to the user.
You have to apply enough pressure so the mechanism comes in contact with the bit. Hence my note about keeping it clean and greased.
If you've ever used one for wall chasing you'll soon appreciate the lighter model. Regardless of how strong you are. Or think you are. ;-) Pretty well everyone with experience of using them says so. But feel free to find out for yourself.