Before getting this, I experienced a kick-back with a 2.5" x 2.5" x 10" block of wood that knocked the wind out of me.  If these had been on my saw that would not have happened.  Between these and the Gripper hand feeder I feel a lot safer with my table saw.  I highly recommend these!  But read the instructions....  using these incorrectly (like not having the rollers on the correct side on small stuff) can make them more dangerous.  So again, these provide excellent safety _when setup and used correctly_.