I had a local shop in Simi Valley, CA perform the reset and it worked completely as advertised! My car's behavior before the reset was similar to others' in this thread:
EV Mode would only come on while braking or at a complete stop (it would go off of EV as I eased off the brake just before a complete stop). There were times where the EV Mode seemed to work correctly, but the power was very low. I thought my batteries were just getting old and weak. Also, since I "suffered" through this condition for a number of months, my brake pads are down to 30%. With proper regenerative braking, the brakes should last indefinitely.
After reset, the car runs just like it used to. I have 120K miles and am getting over 45 MPG combined vs 35 MPG before the reset. Much of my driving is between Thousand Oaks and Hawthorne, via the PCH and 405. Possibly even more important is the smoother ride and lack of frustration. The reset works!