I took it to a nearby park tonight and took it for a test drive. At first I thought I'd have some difficulty with the distance between the chair and the pedals but then I found that there was one more notch I hadn't seen on both of them.
Probably not news to anyone here, but I was really impressed with how well thought out and implemented the controls were. The pedal drive is powerful and since I am a cyclist as well I have a lot of practice pushing pedals. The rudder works seamlessly and the reverse after a short small learning curve is responsive and handy for maneuvering. I found myself picking floating bits of wood and then practicing maneuvering around them to see if I could.
I am a large person and found the i12s more than capable of handling my big, tall self.