I have a 27' Baha Cruiser Catamaran twin 300s I have the Garmin 40 reactor with smart pump, my boat wt is 8420# I troll all day in any condition. I can go from .09 to 3 mph + haven't used bags in 2 yrs any A/P is better than none, A/P is something no boat should be without jmo . I like A/P when setting up to troll set A/P set speed set big boards and lines relax. I installed my A/P myself takes a little time but is well worth it, I also installed a A/P on my friends cable steered Sea Ray he also loves it go 4 it.