The only programing issue i am aware of is the ones that were marked modified april thru sept 2001 i had a couple of those and sent them back to hitec last week got them back in a week reprogramed. The new ones i purchased from Chief Aircraft i paid 74 dollars each , i dont thinkyou can get Jrs for only 15 bucks more , if you can i would like to know where sounds like a good deal on the Jr servos.