Performance figures are MT-Propeller’s, at sea level in ISA conditions (cruise at maximum takeoff weight). Results vary by aircraft.
Baron owner Craig Sommerfeld flew his 2007 G58 at maximum gross weight with the original Hartzell propellers, then again after the MT 4-blade installation. His results, as reported in the American Bonanza Society magazine:
He also reports a smoother engine at idle and in cruise, and a quicker response to power changes that makes the props work well as speed brakes on landing, including in gusty crosswinds.