I love Multiplex servos. They are MCV2--Yes they are programable--this makes it nice when hooking up the rudder. The newer models are not. However I have a number of the older ones that I can program so I am OK for a while--(you can get a LOT OF THROW WHEN YOU PROGRAM IN 180 DEGREES). Shame they quit making them. With the newer models, I hear the programer only works to reverse them. Aerografixs can give more information than I can (PS-the Multiplex programer was $45)