I installed one on my boat. I hear some people have issues with it but I haven't.
At times it can work a little hard in wakes, waves but it still keeps me straight.
I fish alone 90% of the time and I wouldn't be without one. Setting the gear with the boat being kept straight is good but when you have a fish on that's when it shines.
I'd get the itroll to go with it as well, about the same cost as the throttle part on the TR1 but much better made.
I bought from GPS city here in Canada and can't understand why they are so cheap. I installed it myself, if your in any way shape or form handy it's too easy. Just follow the instructions word for word and its child's play.
Like I said, for the guy out on his own, it's a gift. Buy one.