Thrilled with my I-pilot, also had a co-pilot and was very happy with that. I can't say how convenient it is for bass fishing (tournament), but I have a center console and love being able to control from anywhere in the boat.
Except for the slow response because a motor turns the unit, I love mine. I fish alot of offshore structure and it keeps me on it (all day if necessary) while I change lures, get a bite to eat, pee, whatever.
Another vote for 24 v i-pilot. You would be amazed at how well it does in the river current edges. Auto pilot is fine, but i-pilot is a big improvement.