I have the Terrova with I-pilot. Foot pedal never been hooked up. The remote works great.
The spot lock will hold you in a spot with say 15 feet of accuracy. I tried it several times for holding me over a large stake bed. Does not work for this well in my observation. I spent a lot of time waiting for to correct its position. I could hold much better with the remote in hand. Now spot lock is awesome when you catch a fish have need time to measure and put in live well (Wannabe you can overlook this part) spot lock will hold you close so you can get right back to fishing. Also Spot lock is awesome when you are putting out the trolling poles or trying to hover over a spot with trolling poles.
Advanced auto pilot is great because you can set speed for trolling and direction and forget the trolling motor.
Track play back is great for long line or crank baits but not for slow trolling. The correction is too fast.