I have a Powerdrive that I like very much and I was interested in them as well. I had a chance to play with one a a Cabelas in Arizona and I liked it. The momentary switch is centered it seemed easier to turn the motor wile keeping the motor on (albeit I was standing still on the showroom floor). The cable that connects the pedal to the motor is also thinner and the way that it is connected to the motor does not look as if it will disconnect as easily as the original PD. No way of knowing if they have addressed any of the problems with the pedal until some people start using them. What I am worried about is the availability of replacement pedals for the old models.

I also played with the Terrova. I liked that motor as well even though the pedal is considerably larger although not that much thicker/taller than the current PD. I especially liked the stow and deploy feature, it makes it much easier to get the motor out of the water. It is still not as easy as a rope-pull an a scissor type mount but better than the current system. The motor seems like a beefier motor all around and will probably be the motor I will buy when I replace my PD.