My boat had no rudder on it when I got it.
Besides being unable to keep it in a straight line in the 5mph zone, it had a real tendency to spin out.
I put the rudder on, and IMO the difference was night vs day.
Much better experience to say the least.
I will never take it off.
My ole Jet-O-Vater had a large rudder >it was great!
My current Place Diverter does not >I certainly notice the difference.
Low speed docking the rudder wasen't very useful >however > once up on plane they do wonders, especially with my 21' Daytona.