I don't have the powerdrive, but I have the ipilot terrova and love it. I have the foot pedal but most of the time I use the remote and fine it easier. with the ipilot the foot pedal can be used just like a standard foot controlled or like the power drive foot pedal. the response is not a quick as a standard foot control but I find it not a problem. I mainly spider rig, but when I dip trees it works well for me too.
hope that helps a little.