the 20" transom is the only downside to the 2220, i get swamped everytime i slow down quickly or have to backup in a slight chop. i have never been on a 2400 or 2420 to actually see the difference, but i would expect it to be a little better at keeping the water out. i also say the bob's jack-plate would be superior. i will be changing over this spring to bob's from the CMC 10", (turd)!!!