I have the Terrova,,,and love it.
I use Lowrance so I cannot use the I-Pilot feature but wouldn't anywho.
I never used a cable steer TM,,,,,always had hand control so my adaptation to the electric steer motor on the Terrova was not an issue & don't know why it would be an issue for leaving cable steer and going to either the Xi5 or the Terrova. The steering is great,,,,the functions of anchor lock and trackback are really great to use. The remote is fantastic when fishing alone. I highly recommend either.