In response to the request for info on Ida sailor rudders I can offer this. Although I just purchased a Monty 23 I still own and race a Santana 23. There is a fleet of four locally here. Three of the four have replaced their rudders with the Ida sailor replacement which is advertised as a superior foil that will increase upwind ability. I am the lone hold out with the stock foam/fiberglass rudder. We had a regatta this weekend in which we had another Santana from Phoenix sail as well. Winds were 10-20 on the first day and 20-25 yesterday. He also was sporting a stock blade. As for the increase in upwind performance? I say bunk. If anything I'd say the stock blades were better. The Phoenix boat and my boat were 1 and 2 to the first mark every time for the 5 races held. I don't know that the Ida sailor blade hurt the other competitors, but there was certainly no advantage that would make me think I'd want to purchase one. However, one disadvantage I have seen is that one of the three Idasailor blades has already broke in half on a heavy wind beat. The factory did honor the warranty on it and sent out a new blade. However this did not make the skippers job any easier as his boat spun out in some pretty gusty conditions. Idasailor claimed that the material used in that particular blade was sub standard and not UV stable causing it to break. This is supposed to be remedied in the new blade. The blade was less than 6 months old. The other two blades are still doing OK. Personaly, I'm just not sold on the product claims or its durability.