I currently have a have a rudder, and so far it is 50/50 decision... I was out in chop, and it was waaaaay easier to control tracking your boat. However, it is does take away some simplicity of kayak fishing.
Thus far, the my legs are too high up, but I think longer cables will work better, which are currently on order. There was some concern of wrapping up my lines in the rudder system, but thus far nothing that couple be popped off, but I feel one day I will get tangled up badly. I know rudders are for tracking

, but they aslo allow you to turn around in a hurry for boils, etc...
It is kinda wierd at first, because you are constantly using your feet, if not slightly, at least that has been my experience, again taking away from the simplicity of kayak fishing... or maybe I have it wrong, making it more simple...
I am definately going to buy surf board foam pads, or something similar for my footwells, my feet constantly get chaffed on the heels rubbing against the footwells, using the rudder pegs... So far, I am going to leave the rudder on... but the jury is still out...
chris