Still, from the first bicycle company that adopted the self extracting bolt on square taper it was a scandal that it took them so long to fit one on their Power torque (when one will actually make a big difference)
I had no problem removing my Powertorque crankset. Used an angle grinder to cut the NDS crank into slices. Only way it was coming off - I'd already trashed one puller trying to get it to move, and that was with a 4 foot breaker bar.
Ultra torque is dead easy to maintain and Power torque isn't beyond the scope of the home mechanic either.