I have the 12 volt Terrova I-Pilot. I do not have it linked to my DFs. You gonna have 40 people tell you to get the 24 volt and if you were going to concert to 24 volt anyway, then get the 24, but the 12 volt is more than adequate to handle the Tracker. I have the 16.5 Pro Team Tracker. First thing I noticed was the 55# thrust Terrova seemed twice as powerful as the 45# cable steer MG that came on the boat. I seldom run at more than 1/3 max speed. Only time I hit max speed is if I am moving from one brush pile to another. I can tight line for hours without depleting the battery. I don't long line much so I don't know how it would hold up running a 1+ MPH but I know it would be several hours.
One thing I would strongly recommend is getting the MK quick release mounting plate for it (about $80 for mine). First it makes installation a snap and it allows you to quickly remove the motor, like about 10 seconds. I cover my boat and these type motors have to protrude over the front of the boat, so I pull mine into the boat before I but the on cover.
Also, you can take it off and lock in your car or take in the room if you are staying at a hotel or cabin and want to be able to sleep at night. It has the capability of putting a small lock on it which would deter a quick snatch and run, but a bolt cutter and it would be gone in a minute. Cost too much to tempt a thief so I lock it out of site in my car if I am away from home.
I got the Terrova because the deploy and stow feature works really well, but also because I could not convince myself I would not want a foot pedal. I tried the pedal to see if it worked, put it in a storage bag and have yet to take it out. The hand held remote, which I wear around my neck, is just too easy and simple to not use.
This unit is by far the most usable item I have ever had on a boat. You will love it.
One more suggestion: Talk with Brian at BBG Marine, one of our sponsors. He will meet or beat most all big box store prices and know his product so he can keep you from buying the wrong item.