I had owned the xi5. I absolutely hate the way the foot control operates. I like the smooth operation of the foot pedal on the Ultrex, You can run a shoreline with it, without ever having to look at the motor to see where it is pointing. Because the pedal stays toe down or heel down, like normal cable drives do.
The foot control on the xi5 goes back to a neutral postion and engages roughly by comparison, and you can't feel your way into a direction change.