Hi I have 290's, I fitted ali anodes last time and my legs seem to have been attacked. Maybe using ali is not different enough to the other ali parts we are trying to protect. My props were bad as well, had to replace one.
I have had a galvanic isolator for half of the time, and the marina have just upgraded the electrics on the pontoon. So there are some variables in my case. But I dont feel I can risk them again.
Im only asking for ali anodes because thats what i used last time. Lasted two years only half wasted and no other problems. It seems each area and situation are different.