I've got a 21 ft pontoon with a Terrova 80 and ipilot (old version). I was really leaning towards a 55, and got some good advice and bought a used 80. I love the spot lock feature, which is why I wanted the ipilot to start with. I fish a lot of open water, and this feature is priceless to me. I honestly don't use many of the other features often. I also like having the remote and the deck being clear from cords and pedals. The cord that comes with the foot controller is about 300' long and is a PIA in my opinion.
Before you decide on the thrust, you might consider how and where you plan to use it. I have had some great fishing trips spotlocked in open water on windy days with it almost maxed out (running at 8 or so constantly to stay in the same spot) and never run the batteries down. But if you are fishing smaller lakes, protected coves, etc. you may be happy with the 55 and that you don't have to jack with an additional battery.
If I were you, I'd explore the classifieds here and Craigslist. I paid about $450 for a gently used Terrova and 2 bank charger, and bought an ipilot system for $100 from someone upgrading to a link.
Edited by ShinerInTx (07/11/17 09:53 PM)